2.79; It might be something to do with my blend file, it's been through a few Blender versions after all. The same occurs on my laptop using 2.79. Going through it some more, apparently some of my weapon animations export and don't crash (as expected) while others cause crashing. I do have one isolated file that has this issue, it's a copy of one of the scenes from the original file.

https://www.dropbox.com/s/4es2j574quj583z/M16A2%20Isolated.7z?dl=0

Important stuff from debug mode:


Scene updated 29 objects in 0.012563 sec
bpy.ops.object.posemode_toggle()
bpy.ops.object.mode_set(mode='POSE')
Error: EXCEPTION_ACCESS_VIOLATION


This happens consistently when trying to export the active animation from the selected skeleton whenever it's hidden, regardless of SMD/DMX. The export finishes successfully, but Blender crashes completely. I don't know when this started happening, because it didn't always happen (A while ago i would normally export while the skeleton is hidden), starting to become annoying.

(whoops wrong forum, deleted and reposted here)

Kazotsky Kick Robot Soldier salutes you, it functions perfectly!
http://puu.sh/k28l6/5a68bbff21.png

Oh, brilliant! You have my appreciation sir.

Really now? That's really interesting, so 2.7 or some update between then and now broke it?

You have my thanks, sir. Hopefully this will be fixed soon, because I would certainly love to continue working on my projects with modifiers and actually be able to export them.

Sure thing, here:
https://www.dropbox.com/s/g1rj9t9kd451puq/Blender%20Bug%20Solve.7z?dl=0
I included all of the necessary scripts to compile a test model which will assist in showcasing the bug. I am running the most recent version of Blender and the tools itself, of course.

I was doing some animation work for a major project when I noticed something: Blender isn't exporting certain bone modifiers properly with the animation.
My case here is that I wanted to adjust a Valve animation for the Soldier robot, the Kazotsky Kick. The elbows looked bad so I decided to whip up a rig and correct that, but I ran into a problem with my setup. I imported the original animation as a separate skeleton and used modifiers to make some bones copy location/rotation where necessary from the other skeleton. The problem is, the exported animation when compiled only shows signs from animation work I did to the skeleton myself like moving certain elbow helper bones around, not any of the other transformations it should have copied from the original animation.

The only way I can think of fixing this for the moment is by applying visual transformations to baked keyframes, which is fine for a small two second animation or something, but this is the Kazotsky Kick. It's 352 frames long. If this can be fixed (I would imagine it could somehow), I would greatly appreciate it. The only other alternative I can think of is trying to copy the individual keyframes for those bones back onto the new skeleton, which would be a huge pain.

I created a test case that perfectly reproduces the issue.
Here's the blend file to it if you want to test it:
https://www.dropbox.com/s/765rpe4ap9pbgij/ReplicateTest.blend?dl=0
Bear in mind that, in the case of the actual blender save, I'd prefer to have the 'pieces' to the main object categorized as such. They can be exported individually, but not as a group (as I'd prefer to export whole 'characters' along with the base pieces for the ease of users in the future).
I'd put the actual blend file up but I'm sure you wouldn't care for what it is.

[EDIT]
I've discovered a way to fix the issue that I'm surprised I hadn't seen beforehand.

To fix this, you just need to add the skeletons of the respective objects to the same group as the objects themselves. However, that's kind of inconvenient, and I would greatly appreciate a possible fix for that (perhaps to search for the skeleton by modifier definition and ignore parenting?)

[EDIT 2]
The same error also arises if the skeletons are in pose mod/something other than object mode.

I have a feeling I know where the issue lies, but if the issue is what I think it is, then I believe it should be fixed.
Here's a link to the error I receive:
http://puu.sh/ghjTh/a2df9b5f58.png

The way I've organized this particular model has the many skeletons for various accessories to the main model parented to an empty (Purely to group them in the list). I have a feeling that, even though the armature modifier points correctly to the skeleton and it deforms fine in Blender, this is causing an issue with exporting, as I have a separate model with similar accessories in the same blender file but with the skeletons all under the same parent.

Currently I am using the most recent version of the tools with Blender 2.72. I received the same issue with Blender 2.73a, however.