Hadn't come across this tool before, but it looks pretty good (I've added it to "the list"). It's certainly far less intrusive than the "big name" products (Purify, BoundsChecker, etc.), especially in "auto-run" mode. Now I just need to see whether it's sufficienly helpful in getting the job done...

P.S. Been rather remiss with posting lately - I'll try to do better, but as I'm off on holiday in a couple of weeks it might not be for a while...