Interesting that the Win10 laptop causes issues and the Win7 one does not. Have you always had problems on the Win10 machine, or did they crop up recently? It’s possible that Windows patches can cause problems, and our QA team might want details by looking at the log files from your machine.
You strike me as highly tech capable, so this next set of steps should be simple for you.
Step 4. On the problematic Win10 laptop, save the aforementioned log files. These contain data that tells us about your laptop configuration, the launcher application logs and the game application logs. In Windows Explorer, copy the entire Logs folder located in Documents\Zwift to your desktop.
You’re not going to do anything with those log files yet - you’re just saving that folder someplace where they won’t get zapped in the next step.
Step 5a. Manually delete the game’s application folder. That’s in C:\Program Files (x86)\Zwift
Go ahead and nuke the entire Zwift folder.
5b. Please download the latest Windows app from zwift.com/download and install it.
Did the uninstall / reinstall solve your issue? If no, that’s when we’ll want to see those log files.
Step 6: Write in to support@zwift.com and attach all the log files (please compress into a ZIP archive to save space).