Hi, looks like my issue with Vegas12 looks very similar. The same glitches and broken sound when moving the bars or going with cursor over the session. And the same experience with Sony support:)
Have you already found the solution? I have been dealing with this for 3 months now, and i am still unsuccesfull. The only way to get rid of the glitches is to bypass all plugins used in the session- but of course this is not the souluton. I was contacting my plugins tech support (psp audioware),- they had tried to help saying that this may be a vegas buffer setting issue. I made all possible changes and noticed, that the bigger buffer size – the smaller glitches amount . But they haven’t disappeared anyway. this is all I can say about that. Pleas LMK if you solved this problem already
best wishes
jacaszek