D3DXLoadMeshHierarchyFromX reporting : "D3DX: D3DXCreateAnimationSet: Interpolators cannot

Hey All,
I am trying to flesh out a stable .x skeletal animation / mesh export pipeline for the Blender modeller.
D3DXLoadMeshHierarchyFromX is printing "D3DX: D3DXCreateAnimationSet: Interpolators cannot have a NULL name" to the console when trying to load some of my more complicated skeletal animations in DX9, and subsequently failing.
Anyone know what this error means?

If i remove some of the AnimationKey chunks with certain bone names, the error doesn't trigger.

It kindof appears that the order that I am presenting the AnimationSets, or the order that I am building my bone hierarchy might be causing the problem because of some dependency in the order that the bones or animationsets are presented to the parser.

I tried a less hierarchicaly interdependent animation ( a snake ) and that exported with no errors, but after adding a bunch of wierd keyframes in Blender to different bones, it ended up breaking with the same error.

also
The use of semicolons in .x files seems somewhat arbitrary sometimes, although I have been trying to mirror the styles of existing .x animations I've come across.
Are they actually used to enforce the boundaries around the opaque subtypes that they terminate?

Alternatively, does anyone know of an existing exporter for Blender skeletal animations that is happy with DX9?
I have been adapting an existing exporter that was built for DX8.

Any ideas?

Excuse if these are n00bish questions.. I have only done handmade software skinning before in windows, and not through the full .x pipeline, but i'm gettin there!

Thanks !

Does anyone have Skinned / Weighted / Multitextured Blender animations in your apps :)?

[1707 byte] By [manthrax] at [2008-1-12]
# 1
I don't see this error message printed anywhere in d3dx. Is the error message above coming from your application possibly?

Also, does the .x file load and animate properly in mview and/or dxviewer from the SDK?

PaulBleisch at 2007-9-9 > top of Msdn Tech,Game Technologies: DirectX, XNA, XACT, etc.,Game Technologies: Graphics...