Hello,
The Teamviewer connects and will control the remote PC, But all I see is a gray splash screen.
The things I did to try to repair are,
uninstall Teamviewer, Delete the program file folder, went into regedit and deleted folders following the uninstall instrustions and reinstalled still no luck.
https://community.teamviewer.com/English/kb/articles/16835-how-to-uninstall-teamviewer-on-pc