level editing (black tiles)

[haunter]

I have a bug in my level editer... When im working on these levels that have a map... when ever i try to edit this one level (whether i move my cursor into it in editing mode, or press F4 when im in it with my player) all my tiles go black! all i can see in the editor are NPCs and the yellow and red rectangles from the warps and signs... And i have to restart graal everytime it does that... and its not from an addtiledef script, because i set my offline tile def txt file to read only cuz it was making me mad... anyone else have this problem?