Custom Collision Troubles

[Genzel]

I'm currently working on a mod which would add Orcish weapons to Oblivion. All is fine except collisions. This is the first time I've had trouble with collisions when exporting from Blender. I've followed the "Blender/Custom Collision" tutorial on the Construction set wiki down to the letter, and I have also tried doing exactly as I have done before when making new Oblivion objects. The weapons I have made so far float in place and cannot be picked up or moved. If I take the ones from a container, they work perfectly. I have other items in the same cells which I have made and which use the exact same collision settings etc. My most recent attempt involved settings the object or its bounding box as a dynamic, rigid body actor. I have tried convex hull polytope and plain old boxes/cylinders. Anyone know the problem? Is there anything I can do from NifSkope? A short explanation of a simple way to make a collision in blender or nifskope would be appreciated.