What machine specs do you use in the emulator?
How much chip(graphics) ram is left?
Sorry to reply to an old thread but I am having a similar problem whilst setting up UAE4ARM on my chromebook. I put OS 3.1 on it a few weeks ago and it has been running fine but today I installed NewIcons and Visualprefs and the system keeps hanging. It seems to be related to the WB backdrop. If I remove the backdrop completely everything seems to be ok but once I set the backdrop to a picture I can no longer open windows or files. Very strange...
I tried that new SetPatch but it made no difference. Did anyone ever resolve this issue?