>Does VFP5 have the ASTACKINFO() function? If so you could create a timer which fires every 500 milliseconds, and populate a PUBLIC variable with the line that it's currently on. By examining that value in the watch window, you'd at least know what the real source code line is/was.
No, ASTACKINFO is relatively new function introduced either in VFP8 or VFP9.
If it's not broken, fix it until it is.
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