Strange shadow/texture issue on Save Scene

Hi,

I've got a strange texture/shadow issue that happens only on one character in my scene. It seems to happen when I save the scene (I can reproduce it on scene save) and it does not happen to any other models in the scene, even a similar one made with exact same workflow (out of Daz3D, via FBX, in case it's relevant).

I've tried playing with the material maps, but this does not seem to help. The only way I can get the "correct" look is to reimport the FBX, but this does not last and will reset once I save the scene.

I've attached two images that show the difference, one before save:

http://db.tt/HMw1aHDP

...and one after:

http://db.tt/mntVGux3

Anyone have any ideas? Am I missing something obvious?

TIA

Ryan