>>Actually, I missed the initial point. I will try a test using the Timer to perform the release. That should better relate to how the QuitApp functions.
>
>Yes, this would be helpful. Also please try without NOWAIT option and I'll try with it in the meanwhile.

Sorry. For a moment I lost connection with this thread.

Here is what I tested using a timer class,

*-- simulate the QuitApp timer call.
oo = createobject("tmrtest")

*-- create test report
use home()+"Labels"
create report Test2 from Labels Column

*-- open test report (modal), adn wait for timer
report form test preview

return 

DEFINE CLASS tmrtest AS timer
	Height = 23
	Width = 23
	Name = "tmrtest"
	Enabled = .T.
	Interval = 10000

	PROCEDURE Timer
		
		*-- Close Report Preview window
		release window "Report Designer"

		*-- just because.
		doevents
	ENDPROC
ENDDEFINE

I will now take a closer look at the QuitApp to see if there is anything in it that would prevent it from closing the Preview window.