FBX deleting UV's

Xenier

I've been having the weirdest issue, my FBX exports (which were working fine before) are now borking up my UV's when I export. In both Marmoset and UDK when I import the UV's are either completely messed up, or non existent. Additionally, in UDK, despite having multiple materials assigned to my mesh, it only registers multiple material ID's when the geometry is a separate mesh (in maya) but exported as part of the same FBX. My FBX exporter does through a warning that it cannot export some materials, but I've gotten that before with no issues.

Thoughts?