Ugh. Well, this is rather fun.
I've got a custom object list, a fairly big one, that absolutely refuses to export. The maps that share it export fine, as does weather, sky, and water.
I've tried the solutions that were suggested to other members with similar problems, and none of them have worked. The only thing I could think of that would be a problem would be the size of the list itself - and I've tried separating it into different lists, but this still didn't make it export AND it erased objects from the maps.
Any ideas, FH Crew of Wonders?