While working on a project, the UX of Cubase 7.0.1 x64 (windows7) stopped responding. Everything appeared normal but no key commands or mouse interaction would work. Using the play and stop on the CMC-TP still worked and the transport still counted and the current time locator moved while the music played.
The last thing I did was choose to insert an instrument track and then chose cancel instead of choosing an instrument.
This seems like a window handling bug as the app is still running but the UX won’t respond to clicks or keys (but does respond to MIDI from the CMC controllers)