When I import a mesh using FBX, it imports just fine with no surprises. However when I reimport it I get funky smooth groups.
To make matters worse, despite the content browser displaying the mesh with funky smooth groups, it doesn't seem to affect the meshes already imported and instanced in engine. Shown above are the same meshes; one in engine and one in the content browser. However adding another mesh from the content browser yields similar results.
Is there an option (or series of options) I'm overlooking during the reimporting process? I've had this happen with the November 2011, February and March 2012 builds of UDK.