Yes, I do play the UWA version. I had IV originally on my Apple IIc and got as far as the Cube, but never finished it (the only game I never finished, so you can understand my desire to do so). So I purchased this version to do exactly that. I can pinpoint the problem on the map. It's level four, two east, three north. It's as if the rotator just to the north is permanently stuck facing a direction that automatically puts a wall to the south _ shutting me in when I come back up the stairs.
Crazy idea - but do I need to go back to that square and have it reset somehow?