I am trying to debug some ActiveX and found this article that says that VFP makes a call to the PeekMessage API between every line of code to process the OKL commands (at least), so, a call to _tally after a select statement might not occur inmediately after the select, and if in the called code you have a command that modifies _tally you are back in trouble
http://support.microsoft.com/default.aspx?scid=kb;en-us;143303
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