I would suggest sending the offending model/models to EON.  I have done this in the past with 3ds etc.  They were able to nail down the problem & fix it up in a an update.

For example, when 7 & 6 came out various(not all) 3ds models were causing Vue to crash or hang up so I sent them a sampling of offending models...In the next update this was all fixed up.  Typically if you get the model in when EON issues a fix you can see the irregularities in the geometry ie odd verticies/odd welding/bad uvmaps/bad normals etc etc. 

IMO - send them the model/models you are having issues with.