Sorry for the late reply!
It's actually quite difficult to follow your description:
I log out
logged out from Boxcryptor? Or from google drive?
I can still open the files offline!? I tried everything. Arrghhhh....
What do you mean by open files offline? Boxcryptor for Windows is designed to only work with offline files, that means that files must be physically accessible (or on a network drive) to be processed via the virtual Boxcryptor Drive
Please clarify your description so we can help.