mudbox parts of model disappear after creating a paint layer

[Junglemaster]

ive made a crossbow mesh in 3ds max and exported it as an obj to import to mudbox. It seemed just fine after import. here it is:

http://i.imgur.com/rGPNVO0.png

However after adding a paint layer this happens:

http://i.imgur.com/8jHM3DR.png

Ive found online that it can be a problem with UVs. Heres my UV map:

http://i.imgur.com/fPIU900.png

I use 3ds max 2012 and mudbox 2013. Could it be an export/import problem?

Edited November 9, 2014 by Junglemaster

[Percevan]

That kind of issues as generally three possible origins:

- inverted normals of the mesh.

- flipped UV shells

- GPU driver issue.

I would start investigating in that order.