>Maybe there's something screwy with record #525?

I removed it and the same thing happens a few records later. I cannot find the pattern in all this. What I know is that this is happening about four times a week, causing errors in the application, at various levels. One level is at every hit where we update a field in the user table. There is no error in there. This works about 25000 times in a row. But, on a particular hit, I have this irritating error message.