On Monday I was trying to use iChat AV and the video was SO SLOW I could not move windows, type, nothing! I thought it was my DV cam vs. my 500 TiBook.
Then I logged out and back in today, and tried it again with my brother, and the speed was great! Then while we were chatting, he launched SnapzPro and his 933 went to hell performance wise. It took him over a minute to get logged out.
Then I recalled that I had launched SnapsPro on Monday to take a screenshot in the morning, so it had been running already.
Thus, we seem to think that SnapzPro does not like iChat AV, or vice versa.