Hi Volodia,
I think it's exactly the same bug.
I've opened a thread in win XP section too and Digi reply to me.
link
Did you notice that in 7.1?
I was afraid that was an XP related bug (we recently switch from a G4 PTMix and you know...), but it seems that on OSX it's the same.
I'm very scared about this because we have sometimes tracks with tens and tens of punches and I'm afraid to loose something without notice it...
Please let me know if you find a solution other than come back to 7.1 ( I can't live anymore without VCA )
Steve