When Your ProTee Stops Reading Shots Reliably: A Symptom-First Repair Guide

When a ProTee VX stops reading shots, or reads them strangely, the cause is usually one link in a chain rather than the whole system. A shot travels from the camera through its cable or adapter, into Windows and its serial port, across ProTee Labs, and finally into your simulator software, usually GSPro. A break or slowdown anywhere along that path looks like the simulator missed your shot, which is why people often start fiddling in the wrong place.

This guide starts with what you see on screen and sends you to the layer most likely responsible. Read the section that matches your symptom first, and only move on if it doesn't fix things. Most problems fall into a handful of groups: a dropped data link, a Windows port that Windows has taken over, a driver or cable fault, security software interrupting the stream, or setup issues like lighting and tee position. If you're still weighing whether the VX is the right unit, our ProTee VX review covers the hardware itself.

How we put this together: we compared ProTee's published guidance, support material and owner reports, then sorted the common failures by symptom. Links on this page may earn us a commission.

Start with the symptom, not the settings menu

Resist the urge to change settings at random. Changing three things at once makes it impossible to tell which one helped. Use the table below to pick a starting point, then work through that section one step at a time.

What you see	Most likely layer	First thing to try	Section to read
No shot registers, or reads stop mid-round	ProTee Labs link or USB power	Keep the ProTee Labs window open and check the connection	No read at all, or reads that stop mid-round
Mouse pointer jumps, or the COM port disappears after a reboot	Windows serial mouse detection	Disable the Serial Mouse entry in Device Manager	Pointer jumping around or the COM port vanishing after a reboot
Shots register, but spin or curve looks wrong	Spin AI, ball, lighting	Confirm Spin AI is on, then check the ball and light	Shots that register with odd spin or curve
Tee shots misread while mat shots read fine	Tee position and tee area	Clear debris and set a consistent tee height	Tee shots misread while mat shots read fine
First golfer reads, next one does not	People or shadows in the capture zone, rushed ball	Mark a wait line and wait for the ready cue	One golfer reads cleanly, the next one does not
Everything broke after an update	Security software or driver replaced by Windows Update	Check Device Manager and your security exclusions	Security software that blocks the data stream

A single odd number is not a fault. A pattern across several balls with the same club is worth chasing, and that pattern tells you which row of the table applies.

No read at all, or reads that stop mid-round

This is the most disruptive failure, and it is usually the easiest to prevent. The ProTee Labs connection window is the bridge to your simulator. Close it mid-session and the link to GSPro drops, even though the camera keeps running. Players often do this without realizing it, because the window seems like something you can tidy away.

1. Keep the ProTee Labs connection window open for the whole session. Minimizing it is fine. Closing it is not.
2. In GSPro's launch monitor or connector settings, confirm that ProTee is the active device. GSPro should show a connected status. The exact wording changes between versions, so look for the equivalent in your build.
3. If the link is stuck, restart in this order: close GSPro, close ProTee Labs, power cycle the ProTee hardware, reopen ProTee Labs and wait for it to show the device, then open GSPro. Opening the programs in the wrong order is a common reason the link never comes back.
4. Update both ProTee Labs and GSPro to current versions. Mismatched versions are a known source of connection bugs, so keep them close together.
5. Turn off USB selective suspend. In Windows, open Power Options, go to the advanced plan settings, and disable it so USB is never put to sleep. Long sessions are where Windows tends to power down ports.
6. Open Device Manager and look for a yellow warning icon on the ProTee device or its port.

If the device still drops after these steps, move on to the adapter and driver checks. A failing port or cable looks exactly like a software fault from the simulator's side, so don't assume the software is at fault until the hardware path is clean.

Pointer jumping around or the COM port vanishing after a reboot

Some ProTee setups connect through a USB-to-serial adapter, which Windows presents as a COM port. Check ProTee's documentation for your model to confirm whether yours uses one. The camera-based VX connects differently from older sensor-based mats, so don't assume the steps below apply to your hardware until you've confirmed it.

If your setup does use a serial adapter, you should know about this problem. Windows can mistake the incoming serial data for an old-style serial mouse. When that happens, Windows grabs the port, and the cursor can jump or click on its own, sometimes right in the middle of a round.

1. Open Device Manager and expand Mice and other pointing devices. If you see an unexpected Serial Mouse entry, right-click it and choose Disable device. Disable it rather than uninstalling it, because Windows may reinstall it on the next boot.
2. Restart the PC, then check that the port still appears under Ports (COM & LPT).
3. If the entry keeps coming back, some owners report disabling the serial mouse service through the registry by setting its Start value to 4. Treat this as a last resort. Back up the registry or create a restore point first, and follow Microsoft's documentation for the edit. A wrong registry change can make Windows unstable.
4. Restart again and confirm that the port is still there and the cursor stays put.

Adapter, driver and port checks

Most failures in this group come down to the physical link or a driver that Windows changed without asking. Work through the list in order. Each item is quick, and the earlier ones rule out the most common causes.

• Reseat the adapter at both ends, and check the cable and plugs for damage. Replace a frayed or bent cable rather than trying to straighten it.
• Plug straight into the computer. Hubs and long extension cables are a common cause of dropped data.
• Use a USB 3.0 or newer port where you can. Some laptop ports supply less power than desktop ports, which matters for longer sessions.
• Keep high-bandwidth devices such as external drives off the same port path during play.
• If you run several adapters, label each one with the sensor it belongs to so a swap doesn't go unnoticed.
• If your adapter is Prolific-based, check its driver. Owners report that the generic driver Windows installs can fail. Some have reported that choosing an older Prolific driver from a list, rather than the one Windows selects, restored the connection. Confirm with ProTee support which driver version they recommend before you install anything.
• Stop Windows Update from silently replacing a driver that works. Check your Windows update settings for driver options, since menu names change between Windows versions.
• Check the baud rate under the port's Port Settings in Device Manager. 115200 is commonly cited, but use the value ProTee recommends for your hardware.
• Make sure the COM port selected in ProTee Labs matches the one Windows assigned. A mismatch is one of the most common failures in this group.
• If the device still doesn't appear in ProTee Labs, try it on a second PC. If it fails there too, the hardware is the likely problem. If it works there, the first PC is the problem.

Security software that blocks the data stream

Real-time scanning and aggressive firewall rules can delay or block the data stream between ProTee Labs and your simulator, even though everything runs on one PC. The traffic stays local, but security software doesn't always know that, and it may inspect or hold the connection anyway.

Owner reports name several consumer security suites, including Norton, McAfee and Bitdefender, and mention Windows Defender in some setups. Treat that as a list of suspects to check, not as a confirmed cause.

1. Temporarily pause real-time protection in your security software. Play a few shots and see whether the reads improve.
2. If they do, add exclusions for the ProTee Labs and GSPro program folders and their executables. Your software's settings will show where exclusions live.
3. Allow both programs through the firewall on private networks. If GSPro uses a local network port for its connection, check the port number in GSPro's settings rather than guessing.
4. Turn protection back on straight away. Don't leave it off.
5. Schedule scans and security updates for times when you aren't playing.

Shots that register with odd spin or curve

Spin problems are a different beast from missing shots. The ProTee VX is a camera-based overhead launch monitor, and ProTee's Spin AI is meant to read spin without needing a marked ball. When the numbers look wrong but every shot still registers, the cause is usually the camera's view of the ball rather than the data link.

• Check that Spin AI is switched on in ProTee Labs. The menu name can vary by version, so look for the spin setting in the settings area. Owners report that when Spin AI is off, the position of a logo on the ball can skew spin readings.
• Use even, diffused light over the hitting area. Avoid hard shadows and glare spots. For more on this, see our lighting and camera accuracy guide.
• Use clean, unscuffed balls of one consistent model. Dirt and scuffs can confuse spin reading.
• Mount the camera at ProTee's recommended height and angle. Recheck it after anyone bumps the mount or the mat moves.
• If spin looks wrong for everyone, suspect the setup. If it looks wrong for one player only, suspect that player's ball position or stance inside the capture zone.

Check ProTee VX pricing ↗

Tee shots misread while mat shots read fine

This is a narrow pattern with a few physical causes, and it's one of the easier ones to fix. The system expects the ball in a consistent spot at a consistent height. A worn, uneven or debris-filled tee area changes both, so the reads drift away from what the camera expects.

• Clear rubber crumbs, turf fibers and other debris from around the tee.
• Use the same tee type and height every session. Owners report that stabilizing the tee, for example with a small piece of tape underneath, steadies the reads. This is an owner tip, not an official fix.
• Re-run ProTee's calibration after you replace or move the mat. Our tee height and mat fixes walk through the physical side in more detail.
• Make sure the tee sits inside the camera's marked capture area. The ball and stance positioning guide explains where that area sits relative to your stance.

One golfer reads cleanly, the next one does not

This is the pattern that makes the problem feel random. Often the hardware is fine, and the room routine is what needs attention. Two players with different stances, different ball placement and different rhythms can produce very different results on the same mat.

• Mark a wait line on the floor outside the capture zone. Waiting players standing near the mat, or their shadows, can intrude on the overhead camera's view.
• Wait until ProTee Labs and the simulator both show ready before the next player addresses the ball. Hitting too quickly after the previous shot is a common cause of a missed read. If the simulator itself feels sluggish, see cutting shot delay.
• Place a fresh ball on the marked spot each time. Placement drifts as players change, and small drifts add up.
• Set the handedness for each player profile in your simulator software. Check how your software handles left- and right-handed players from the same mount, since behavior can differ between titles.
• Run a single-player warm-up set first. If one player reads well and a group does not, the fault is in the room routine rather than the hardware.
• Close background apps on the PC during group play. Extra load can slow the pipeline. If your PC is short on headroom, our PC requirements guide lists what the simulator software expects.

A ten-minute routine before every group session

Most of the headaches above are easier to avoid than to fix. This routine takes a few minutes and catches the common causes before anyone is waiting on a shot. Run it before every session, and keep it on a card near the PC if that helps.

• Close background apps and pause scheduled scans.
• Open ProTee Labs first. Confirm the device and COM port, then open GSPro and confirm the connected status.
• Check that the lighting is on and even. Wipe the camera lens if it's dusty, following ProTee's cleaning guidance. For the wider picture, see our sensor cleaning and calibration guide.
• Clear the tee area and set your tee height.
• Hit five warm-up shots with one club and look for a stable pattern.
• Brief guests on the wait line and the ready cue.
• Once a month, check for ProTee Labs, GSPro and driver updates. After any update, repeat the warm-up set before anyone plays for real.

Is it the system or the swing?

Before you chase a fault, check whether the problem is in the data or in your strikes. Good ball-striking gives reasonably tight numbers, so a spread that's too wide for how the shots felt points toward the system. This worked example uses one mid-iron and needs nothing more than the numbers the simulator already shows.

1. Hit ten balls with one mid-iron at a steady tempo. Aim for similar strikes, and don't adjust your setup between shots.
2. Note the ball speed and carry for each shot.
3. For each column, subtract the lowest value from the highest. That difference is your spread. Do this for ball speed and for carry separately.
4. Compare the spreads with how each strike felt. Large jumps between shots that felt alike, or shots that go missing entirely, point to the system. A spread that tracks how the strike felt points to the swing.
5. If you can, compare against an outdoor range session or a second device. If the outdoor numbers look similar to the simulator's, the simulator is probably working as it should.

Every launch monitor shows some normal variation, so a little spread isn't a red flag by itself. For what normal looks like, see why data inaccuracies occur.

When to hand it to ProTee support

Stop troubleshooting yourself when the device doesn't appear on two different PCs, or when the camera shows a hardware error. At that point, support can see things you can't, and continuing to swap cables and reinstall drivers usually wastes an evening.

When you contact support, have these ready so the first reply can be useful:

• ProTee Labs version
• GSPro version
• Windows version
• Adapter make and driver version
• COM port number
• Screenshots of Device Manager
• Any log files ProTee Labs produces. Check ProTee's support material for where they're stored.
• A description of the pattern: which shots, how often, and whether it happens in single or group play.

ProTee's official support site has a help centre. Search for it from ProTee United's website so you land on the current page. If you're comparing options at the same time, our SkyTrak+ comparison shows how the VX stacks up in a similar budget bracket, and the best overhead launch monitor roundup covers the wider field.

Compare overhead launch monitors ↗

Quick answers for ProTee owners

Does the ProTee VX need a powerful PC to read shots reliably?

The camera and connection do most of the shot capture, but the simulator software, GSPro especially, needs a capable graphics card. An overloaded PC can lag or drop the link, so check ProTee's and GSPro's published PC requirements for current figures.

Can ProTee Labs feed software other than GSPro?

GSPro is the most common pairing. Check ProTee's website for the current list of supported simulator software, because the connection steps differ from one title to the next. Follow the setup guide for the specific software you're using.

Will recalibrating fix shots that go missing?

Only if the camera or mat has moved, or the hitting area has changed. Missing shots on a stable setup are more often caused by the data link, a port or security software. Recalibrate after you move the mount or replace the mat.

Why did my ProTee stop working right after a Windows update?

Updates can replace a working adapter driver, turn serial mouse detection back on, or reset firewall and security exclusions. Check Device Manager, driver version, COM port and exclusions in that order.

Is it safe to edit the registry to stop the serial mouse problem?

It's a fix some owners use, but only after disabling the device in Device Manager hasn't worked. Back up the registry or create a restore point first, and follow Microsoft's documentation. If you're unsure, ask ProTee support to walk you through it.