...It runs fine under 95/98, but NT 4.0 users (I believe running the latest service pack) randomly get Dr Watson errors...sometimes when loading our app, sometimes when running a report, etc. There doesn't seem to be any consistent pattern....

I have noticed the same thing, but it usually occurs on NT machine running high resolution screen displays. Try running the app at 800 x 600 for a while and see if the problem goes away. If it does, try getting updated video drivers from the vendor for the higher resolutions. The printer drivers can also be suspect. Also, you get abends in NT when first firing up every so often -- probably a memory collision error of some sort.

Kevin