Hmm, I would take a look at it, but I'm currently away from home and all my debugging stuff. If you don't manage to solve this by the weekend, I'll definitely have a look at it. I can still ask questions tho.

You said you have 2 access violations. Do these two happen in a row (one follows another) or are they separate errors? When do they occur in multi-player (as in certain location or as soon as level loads)? When do they occur in single-player (as in certain location or as soon as level loads)?

I'm guessing its a flipped anim tile with a scenery event on it.