Thanks for the reply Robert.
The thing is, that I've tried that already. I always render to disk using the advanced options to make sure everything is as it should, and always use from frame 0 to frame 0 settings. The interesting thing is that after making some tests, I notice that if I hide some objects in the choreography and then render, it seems to work just fine. So I'm thinking, maybe it's a texture overload on the system resourses themselves. But than again, what do I know?
Thanks for your help though, it's nice to know that this sort of thing don't just happen to me .