I do have the same problem with Cubase 5:
After starting the VariAudio analysis the progress bar moves slowly up to about 70% then breaks up and nothing has been analysed. No outcome at all.
VariAudio has worked after installation of Cubase about a year ago (Win7 64 bit) but now it doesn’t work any more.
I deinstalled and installed Cubase 5 several times and also deleted the personal settings (AppData) but this did make VariAudio work again.
Does anybody have any suggestion how to fix this problem?