I have those problems all the time! Maybe it's a problem of not using Prof. ogl cards.. I don't know. I'll check the tips given here!

But what I just started doing, is to add a shotcut to the Hardware render buffer on my shelf, and use that instead. Actually I fould it to be both faster and, of course, better looking than playblasting. All you have to do is go in and ajust the name and range whenever you need to, but I found that to be a hastle easily overseen.

Nenox