Yeah, it sure does look like a timing issue.

Either the Activate Window or the Doevents works.

Without either one or both it doesn't work.

>It could be timing issue. Try this

_CLIPTEXT = "MESSAGEBOX('TEST')" && Command to paste
>MODIFY COMMAND myprog NOWAIT && Open a program file
>DOEVENTS
>ACTIVATE WINDOW "myprog.prg"
>SYS(1500, '_MED_PASTE', '_MEDIT') && Paste menu item
>

>>Thanks, Sergey. It's working now. Oh, I hate that!
>>
>>>Jeff,
>>>
>>>Try

_CLIPTEXT = "MESSAGEBOX('TEST')" && Command to paste
>>>MODIFY COMMAND myprog NOWAIT && Open a program file
>>>DOEVENTS
>>>SYS(1500, '_MED_PASTE', '_MEDIT') && Paste menu item
>>>

>>>>I've pasted the exact code in the help for sys(1500) and it doesn't work for me - there's no text pasted in. Doesn't work in VFP7 or VFP9 in developer version of VFP or as an EXE.
>>>>
>>>>From VFP9 Help (and is the same in VFP7):
>>>>pre>
>>>>_CLIPTEXT = "MESSAGEBOX('TEST')" && Command to paste
>>>>MODIFY COMMAND myprog NOWAIT && Open a program file
>>>>SYS(1500, '_MED_PASTE', '_MEDIT') && Paste menu item
>>>