That's true, problems with it not shutting down completely but other than that it's still stable, still like you say probably best to give 'em a clean some contact cleaner and a blast of compressed air. I'll check to make sure I don't have any duplicates and clear the cache as you say. Thanks again Bob. --- Post updated --- AHA! seems I've found the solution! There was a bunch of .terrain files in the "levels" folder, deleted them and hey presto the map seems stable. These files wouldn't have anything to do with me playing with the draw distance in thelevelinfo would it?