Ok, I wanted to expand my document window to fit my 2nd monitor, so I hit the little button that has the 4 corner marks on it to expand the window - I accidentally hit the dang thing again and BAM! No window!!
So I tried to resized the window to catch a little piece of it so I resized it to 5000x5000 - still no window!
I tried resetting the preferences to load factory settings...no window...

Uh, help!?

WhatIdo??