I'm using 2.64 and I don't have any problems with exporting/importing
maybe you can try this version if it has enough features
I have problems when exporting a model from Blender to MED (GS A8 with FBX). I tried both Blenders 2.64 and 2.68 but some bones are changed/missing in the armature and the bird wing seems deformed.
I tried other exporters, but generally they are without armature/animation or have another problem. FBX is what better works for me.