i encountered this crash, too, but on max 6 .. so i did some experiments, and, well, it quite simple. just build your animation, in anyway u like to (biped, vertexs animation,etc) and then save your file (maxfile, save early, save often, you know).
then select just the mesh of the unit, building, whatever, not the bones of the biped and go to file-> export selected. (not: file -> export)
that´s all. quite simple, a i said.
ka