[philadelphia killing mach]

Before I run this over to TMT, i'd figure i'd give my favorite degenerates errrrrrrrr modders a crack at it.

Anytime i save a .map and then later reopen it, i'm left with only the floor. All entities, walls, ceilings, lightings, start points, spawn points are gone. Yet when I recompile to make the .map into a .bsp again, DOT screen tells me the entities are all there.

Ideas ?