[Exim] Testing messages released with -Mt command

I have some messages on the queue that I have manually froze with the
System Filter freeze command. When I release them, I never see them get
processed in my debug window (exim -d-all+acl+route+filter -bd -q5m). I
figure this is something simple (it always is), but ... Donno...

Is there some special debug command that I overlooked or some other
command line parameter??