Yep, just ran into that last night. No work around, but to reapply the shaders, or maps. And yes when using imported objects. Another strange one I've run into is, you select a mesh, apply a texturemap, then select the next mesh on the same object. Go into the texture room and the mesh you just selected isn't viewed but the previous mesh you just worked with. I've been able to get a work around when this happens, by applying the default shader to the mesh you can't get into the texture room, then enter the texture room and make changes. Basicly that's the only quirk I'm having so far, knock on wood.