Hi! I see that during your ride in the Tacx Training app on your Mac desktop (macOS 10.15.7), the screen freezes while the rest of your desktop continues working normally. I want to make sure we get this resolved for you.

Could you tell me a bit more about what exactly happens when it freezes? For example:
- Does the app freeze completely, or just the video or graphics while the stats still update?
- Can you move the mouse or interact with the app at all?
- Does this happen after a certain amount of riding time or randomly?
- Have you tried restarting the app or your computer recently?

In the meantime, here are some initial steps we can try to troubleshoot this:

1. Update the Tacx Training app to the latest version if you haven’t already. Sometimes freezes happen because of bugs fixed in updates.

2. Restart your Mac, then only open Tacx Training, to rule out other applications interfering.

3. Check for any other connected Bluetooth devices or apps that might be conflicting with the Tacx app’s connection to your trainer.

4. When riding, if the app freezes, try pressing Command + Option + Esc to bring up the Force Quit menu. See if you can force quit the Tacx Training app to restart it.

5. Since you’re on macOS 10.15.7 (Catalina), ensure your system is up to date with all security and app compatibility updates through System Preferences > Software Update.

If these don’t resolve it, it might be related to the app’s interaction with your Mac’s video or graphics resources during video rides, which has been reported in some cases. We can try adjusting graphics settings or running the app without video to test this.

Could you try these out and let me know what happens? Also, any extra details you provide about how the freeze occurs will really help narrow down the cause.

Are you satisfied with this plan so far? If not, I’m here to keep helping!