Gambini, on Mar 13 2011, 02:32 PM, said:
I had another situation and this time dndebug confirmed that the monster was somewhere above the sector where it was. Let´s try to explain it. This liztroop was right behind a glass locked door trying to get me, suddently dissapeared, i wrote dndebug and seeked him. He was in the building´s roof which is just on top of this door as a sector over sector thing NOT ROR. These two sectors don´t share wall coordinates, their shapes are clearly distinguishable, but the glass door has a thin surrounding sector that serves as a plinth, it has blockable walls. But still I draw this presumed conclusion that, since the monster could not fit inside this sector, it moved to the next one, wrongly taken as the on top sector.
In the previous cases there wasn´t sector overlapping but there was some very thin sector around.
Well I think that changes the category of the problem from "mysterious and disturbing monster disappearances" to "incorrect monster movement in unusual and complex maps". It's probably a glitch that has been around forever and would be difficult to investigate.