As someone else said double check texture info.
I also noticed i ran into crashes when there were far too many objects that are also having their textures replaced on import. What i did was in my editor I group all objects in the map and then import. This of course means its only going to be one object so you have to make more changes from the editor but i found most of my crashes came from not having them grouped enough. Try experimenting with grouping things you know you won't need to tweak as much.