This is just to share the experience - the problem is solved, no stars :).

There's a first for everything. Here's what I started getting the other day:

---------------------------
Microsoft Visual C++ Runtime Library
---------------------------
Buffer overrun detected!

Program: Q:\sopstver\db\VFP9\vfp9.exe

A buffer overrun has been detected which has corrupted the program's
internal state.  The program cannot safely continue execution and must
now be terminated.

---------------------------
OK   
---------------------------

This is the first time in 22 years that I've seen Fox cause a buffer overrun. It appeared only on one particular record, on a rich form with a dozen cursors related to this record. Began to chase it with coverage logging - but that was only the starting point, because coverage output is buffered, and I was getting only the last whole buffer... it pointed to the refresh process, and I at least knew which was the last object to refresh properly. Started setting breakpoints - wait window, messagebox() and the like... and then eventually managed to reproduce it in the debugger. The culprit, after a good day's hunt, was setting a label.caption=left(memofield, 255). So here's some code to reproduce this, if anyone is interested. The commented-out line is the fix - uncomment it and comment the next line, and it works: The text in this sample is a mangled excerpt from T&C of UT:

*-- text block begin
text to c noshow 
Depending on the severity & the situation, when one & the Terms & Conditions has been 
violated, & we may try to contact & member & simply proceed with & proper 
procedures & ensure the good running of the site.

We will coordinate & the authorities to trace & member 
that has violated & law with its dealings & us.

We reserve the right & such a situation to divulge & the authorities & personal 
information that we may have about the member in order to facilitate & locating of the member.
endtext
*-- text block end

LOCAL ol as Label
_screen.AddObject("ol", "label")
ol=_screen.OL
ol.visible=.t.
ol.AutoSize=.t.
FOR i=252 to 255
	WAIT wind i
*	ol.Caption=LEFT(CHRTRAN(c, "&", "-"), i)
	ol.Caption=LEFT(c,i)
ENDFOR
ol=null
_screen.RemoveObject("ol")

*My guess is that multiple ampersands on a label captions confuse Windows hotkey system
* (and whatever API Fox calls for that), as the ampersand is considered the Windows equivalent 
* of \<, i.e. prefix for the hotkey.