Ran into this recently with a very large morph (> 90% of screen real-estate).
How do you get that morph out of the docking bar?
I've resorted to quiting the image and starting over, which is really sub-optimal. If I could not accept drops (or at least be prompted if I drop it when the option is to not accept drops), that would go a long way to helping.
Just now trying this out (not having paid attention to the 'accept drops' check box), I noticed that the very big morph makes Squeak unusable - the docking bar takes up so much space I can't usefully open any other window/morph at all in Squeak anymore. Maybe a second guard to not allow such big morphs - or to shrink them if we do - should be added to the docking bar.
-cbc