Does Blender's Nif exporter mess up the nif file structure?

I've noticed that if I import a clothing/armour mod (that I know works fine), and then immediately export it, the nif file becomes unusable.

It depends on the settings for import and export you use and what you actually want to import and export.
Blender "can" export usable NIF files right away, mine actually does, for my specific purposes anyways, but I still apply all the nice NifSkope-magic steps afterwards regardless. Better safe than sorry I guess.

I tested it again, and it seems fine for working mods now - not sure what happened. But when I try to alter those mods in the same way as I'm trying to to do to mine, it screws up in cs. Import new skellie, ctrl-p then ctrl-a in Blender. Then the trouble start with the export. Not sure if I'm using a wrong skelington or doing something else wrong.

I've uploaded my blender and source files, to see if anyone can fix problem or see whats wrong with it - also on my other http://www.gamesas.com/bgsforums/index.php?showtopic=1074768.

Files here too: http://www.filefactory.com/file/b007fd3/n/ClothingMod.7z

The settings you choose on export can change things a great deal. I'm not good with Blender or the settings, but I've seen threads out there with suggestions on export settings for different scenarios

Thanks, I'll try and dig up the threads. Blender is a strange program. If you stop using it, it becomes a mystery to use again very quickly.

I mainly use the default settings (total modeling noob here), but played around with the settings like collision options, which by default is set to wood. Probably not good for NPCs. But those others do need some formal explaination. The strange thing is that the default import/export works for recent mods, but messes up older Eshme type clothes. It seems to alter the skin co-ordinates and merging it into the body mesh too. Maybe thats why none of the old Esme/ENmod clothes have been converted, or updated due to older nif data. If I run the original clothing mod, the CS always complains about the skin needing to be re-exported too.

I'm putting together a very basic clothing top from scratch to see if I run into the same problems.