Just ran into something interesting (Bug). Follow the following procedure, you'll see the same problem if you follow the steps below:
Step1: Copy the following file into a prg e.g. testprg.prg and save it

**************************************************
*-- Form:         (c:\my documents\visual foxpro projects\abcds\fmtest.scx)
*-- ParentClass:  cbaseform (c:\my documents\visual foxpro projects\\libs\test.vcx)
*-- BaseClass:    form
*-- Time Stamp:   01/28/05 11:07:03 AM
*

Step 2. Press Ctrl+A (select all) while editing testprg.prg

Step 3. Press Ctrl+F3 (find highlighted)

Step 4. Press Ctrl+L (popup find/replace window)

then you get an error message:

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

Program: ...ogram Files\Microsoft Visual FoxPro 9\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 happens consistently.