As of today, I seem to be hitting a strange bug in Shifting Passages (don't yet know if it happens anywhere else). Twice today, I statrted Shifting Passages as a Human Sorceror, with the Fireball Magnet preparation. Both times, I got a little ways into the dungeon, but when I used the fireball to actually kill something, the game revelaed the rest of the map and froze. The first time, it also blacked out all the walls and hid all the monsters; the second time it just revealed everything.
In the first case, I had already managed to use the Fireball to kill a monster (and then level up with a normal hit). On my next use of fireball, the bug hit. In the second case, it went off on the very first monster.