Ive seen it happen on Natali Blonds Coconut Milk show...the clip was a shortish one & she seemed to move & dance a little too quick. Its happened on a couple of other cards which I cant remember too.
I have a Packard Bell AMD Athlon XP-M 2400+, 1.79Ghz, 480 MB RAM Laptop, bought in 2003. I get occasional lag, especially when running other programmes but usually its alright. I quite suprised VGHD runs so well on it :) I thought id get loads of lag when I first installed back in October.