i was playing as a hero and picked up a magic mushroom. and used it. all the objects tiles changed. a tree tile turn on a elf .
so i died by poison.

started a new game as keeper and the tiles didnt came back. tried do save. and reload the map. didnt work the tiles still not normal.
died as a keeper and created a new hero game for recreate the bug. game start normal and get the bug.

steam version. 2015-04-03 4240 (windows.)