Well I've just treated myself to a new MacBook (one of the funky silver ones). 2.4 gig Core 2 Duo processor, 4 gig of memory.
Didn't even attempt to use any of the 0.9.x VLCs, as people still seem to have problems, I just installed 0.8.6i. And even that doesn't work properly either on the new machine. It works fine on divx .avis - but dies on its arse on a 720p mkv (which worked fine on my old white, less powerful MacBook running Tiger). Maybe it's the new NVidea graphics subsystem, maybe it's Leo. Don't know, don't care, can't be bothered with it any more. Sorry guys. MPlayer Extended has just found its way into my task bar.