Confirmed.
I updated the same packages as Crow, with the exception of Calibre.
After that I also updated PulseAudio from testing, so I naturally thought that was what broke Veromix, and I was just going to report it in the testing section when I read Crow's post. I'll revert to the old versions of the PulseAudio packages tomorrow to remove suspicions, but if Crow hasn't installed anything from testing, the PulseAudio packages are probably innocent.