SirFency Blackheart

Im not talking about the mesh feature. I have had no issues with getting meshes into world. Im talking about the Meshes and Morphs menu in the Phoenix Viewer.

I downloaded my avatar head via the Advanced/Character/Meshes and Morphs tool. I took it into maya and it looked as it did in SL I then made a slight change to the mesh as a test and re-uploaded the .obj Whe it apeared in SL the model change kept but the uvs were all messed up. Has anyone ever been successfull using this process? If so whats the trick?