Whenever I run into issues like this, I check things that affect memory more than anything. Like, making sure that any new model files work perfectly in DBPro, double checking memblock creation and modification, array and typed array handling.
If you would like another pair of eyes to have a look, then I'd be happy to help if I can. I'm a moderator here so my actions are more accountable - but anyway I could have a look with complete non-disclosure and I have a couple of debugging tricks that can help find these sorts of issues. Drop me an email if you are interested.

I am the one who knocks...
