3ds Max 2010 crashes on animation when exporting to .x

Hi. I am using 3ds Max to create models for a panda3d-game. Until this week everything worked fine using a .x-exporter I found on google, but since this week 3ds keeps crashing while exporting the animations.

All frames that should be exported are marked as active, nothing is hidden… And nontheless not even the config that used to work last week will export anymore. What I did since it worked was just adding some more frames in the end and revamping some movement in the first animations…
Happes on x64 and x86 alike (using the appropriate plugin version for each)

Any Ideas?