I’ve come across this bug too. I’ve been setting up Retropie over the last few days (using the Retropie script, binary-based installation option). All other emulators seem fine and return back to emulationstation without trouble. Stella is the only one that hangs.
I don’t have any zipped roms in the stella rom folder, but the folder has lots of roms in it. When I get a chance, I’ll try eliminating most of the roms in the folder to see if there’s a bug pertaining to the contents of the rom folder.
Anyone else have any insight?