Good point Corion. I'll widdle it down. I'm in the process of doing that but the error only seems to happen after about 10 hours of processing. Unfortunately the error seems to happen in the most intense part of the script. I reduced the intense part to about NIL and the problem wen away so it's in there somewhere. This is going to be a tedious task and I'm still working on it. I was hoping someone would say "Oh yea, I've seen this problem...". I'll get there I guess.