I wonder if you folks can replicate it , or its something wrong with my install of UT3.

I used that "huge infection tube" skeletal mesh from Necris Deco pack. First suspicious thing is after placing it in my map it loses 3 materials, and they are replaced by standard null material.

Well I applied manually correct materials, but I could not find one of materials applied by epic. It was on mesh in their original map where it was used, but even there after selecting that mesh materials disappeared.

But that Is not worst thing about it. Clicking on that mesh marks Necris Wires package as modified. I found out way around it: set material im kismet in runtime, and do not save that package, and publish after closing editor and then reloading everything without touching mesh.