The reason it works for you is because of the MainLoop, not the SelectionGet(). I stumbled on the fact that MainLoop makes it work just as you were posting. :-) Now I just need to apply traveler's DoOneEvent suggestion...

The other error you are getting is because no other application owns the selection when you try to get it.

Thanks for your help. :-)

bbfu
Seasons don't fear The Reaper.
Nor do the wind, the sun, and the rain.
We can be like they are.