Variaudio; Scrubbing

Hi there
I work with Cubase 7.0.1., Windows 7 ultimate, 8 GB RAM, following problem:

In variaudio when I choose a note to change pitch there is no playback; i.e. I cant hear the signal.

The loudspeaker tool does not work, no playback, same with scrubbing, the tool does not stay in selected track but kind of jumps around.

What coould be the problems?

I made a thorough cross check with Cubase 6.5 where I dont have the above problems and the preferences are set identically.

Thx for help