Thanks for all your replies!
I've tried resaving the model (both in MDL7 and MDL5-formats), with no results. Also, replacing it with a different one sometimes worked, and in other times did not.
Right now, it hasn't crashed in a while, so possibly something I've done magically "fixed" it - perhaps turning the direct view-entity definition into an "ent_createlayer"-call, perhaps distributing the workload in the first frame somewhat. I don't exactly feel super-comfortable with it, but if it doesn't crash, I can't really work on investigating the bug, either.
If it crashes again, I'll make sure to try out PRAGMA_ZERO.
Thanks again for all the help. I'll be back if it stops working again.