I have the exact same problem with the Siege maps. The second map has a giant red x where the doorway at the top of the map should be and a few other red xs throughout the map.

I'm not sure what I'm missing (I have the CSUAC and DD3). I know very little about CC3 and I can't even figure out how to get it to tell me what files it's looking for.

Any help would be appreciated.

All I wanted to do was have the maps as single images without grids, but this is turning into a huge headache.