>>>[Invisible TABLEUPDATE problem ...
>>
>>Put a SET STEP ON on the lostfocus of one of the controls that is causing the behaviour some of your code must be doing this.
>
>I'll try that. I think I can eliminate all of my code except for the refresh that occurs when the value is changed. (Which I've tried once already). But I'll play with the debugger a little more using your suggestion to see if I can catch it. (Does the form refresh default code cause a table update?)

Sorry to steer you wrong here David. If your buffering type is 2, then moving the table will cause an automatic tableupdate to be issued. From VFP6 help for type2 buffering "Pessimistic record locks which lock record now, update when pointer moves or upon TABLEUPDATE( )". My apologies.