When connecting TO 2 of my 4 PC devices, the warning on customized modules terminates the sessions after a few minutes. It does not affect connecting FROM those 2 devices, except if trying to connect between just those two PCs. I have already tried uninstalling, deleting all prior Program Files and Program Files (x86), and reinstalling a new Teamviewer download.
SOLVED: Perform on each PC affected with "customized Teamviewer modules":
1. Open the Command Prompt (CMD) as administrator
2. Navigate to the TeamViewer installation folder
· (Per default, it should be: %Program Files(x86)%\TeamViewer or %Program Files%\TeamViewer)
3. Enter the following command into the Command line:
· TeamViewer.exe customize --remove (do steps 3 and 4 twice to be sure!)
4. Confirm with Enter
5. Restart the PC to load and use modified Teamviewer program.