>Jackpot. I finally emptied out every table/index in all the DBCs, and reconstructed some test data from scratch today. Bingo, no problems (at least for now). This explains why it worked for a while previously, too.
>
>Apparently NT is ultra-sensitive about something that Win9x is not. Something to do with indexes, I'm fairly certain. And I'm hoping NT is not *causing* the problem, but just manifesting it. I will continue testing to see if it breaks again.

Good luck...

From one of your other messages, you said you are *not* explicitly specifying a tempfiles directory. I was wondering if it might be a good idea to do so:

- on a large machine with lots of resources (e.g. RAM) small apps may not write temp files very often. Large apps that massage a lot of data will write temp files more often.