I cannot play any games in the standalone version of Quest on Windows 10 anymore (my own or other peoples downloaded) . I can type commands but it won't accept a Return or a mouse click o a link. It works fine on-line and it works on my Windows 7 machine. Anyone else experienced this? Any solutions?

Uninstall Quest:
Re-install using the RUN AS ADMIN option by right-clicking the installer.
On the shortcut created on your DESKTOP > Right Click>Properties (at the bottom of the list)>Click the Compatabilty Tab> At the bottom of this window you should see RUN THIS PROGRAM AS AN ADMINISTRATOR - check that box >APPLY > OK.
Run Quest and it should work.