Well, I just updated to the latest BoinxTV (a beta release, in fact) and some problems that I was having earlier appear to have disappeared! Things are much more stable now - in fact, I don't see any flaws anymore at all and I have just completed my first video with it, which should be uploaded soon.

I got BoinxTV as part of MacHeist 3 so this was a serious deal and for the moment, I couldn't be happier.