Menu bar stops responding

Cheers!

After the first use, the menu bar stops working. I click on ‘File’ ‘Edit’ ‘Media’ none of them respond, I don’t think alt+f has ever worked to bring up the ‘file’ menu, either. I can always get it to work once right after Cubase is started by mouse-click, but after one use, clicking on it does nothing. I didn’t see this specific issue as a thread so forgive me if it already exists.

Specs:

Cubase 8 64 bit
Windows 7 Ultimate 64 bit
intel i5-3350p @ 3.1 ghz
16gb ram
NVidia GeForce GTX 660