I have a mature (read stable) app last built in VFP 6. I recently converted it to VFP7 and added a few new features. It runs fine from source code and also from a compiled app file if compiled with Debug Info checked. But when compiled w/o debug info and encrypted, it throws an error in an old invoice printing form that hasn't changed for about a hundred years. The error occurs in an option group interactivechange method that has not, I swear, been touched by the hand of man since Boston won the world series. Anybody encounter this behavior or have an explanation? I'm at a loss.