Hi,

>>Where and what is ASTACKINFO()? I am using VFP6....

Another snag - ASTACKINFO() was only introduced in VFP7. The closest you've got in VFP6 is to use either the PROGRAM() or SYS(16) functions although they don't give as much detail. See the SYS(16) help for an example of drilling through the call stack. There's other stuff which might give a clue - you could try LIST MEMO TO PRINT and LIST STATUS TO PRINT...

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There are nine choices. One choice is USE AS IS another is SCRAP. You can see the problem if the control continues to have a mind of it's own.<g>
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Certainly has potential for trouble...Good luck,
Viv