Greetings. I'll preface this with the fact that I'm new to UDK, having been comparing UDK and other apps and finally deciding on UDK because I like the interface a lot more, and it outputs some fantastic results.
Now, I've been wading through tutorials, and now that I've got a level roughed out, I'm going around and adding "flavor" to the level by using some of the static meshes that are included with UDK. When I rebuild my level, I am getting the UDK error "object has overlapping UVs" or something to that effect (I'm at work at the moment and can't check the error). I've mapped 3D objects before and am familiar with the concept of UVs, but I'm wondering if it's normal for these "out of the box" meshes to be throwing UV errors.
Yes, it's normal for the UVs which are used for texture to overlap. It's the lightmap UVs that may not overlap (unless you want for some weird reason each instance of the mesh to use same shadow). You can see that each stock mesh should have two UV sets.
That means your lightmap uv have overlaps. Not the texture. If it's not noticeable, then it may be a minor or hidden overlap and choose to ignore. If it's causing artifacts on your mesh, you should resolve it. Since it's stock mesh, unless you changed the lightmap coordinate index, I'd assume the first case and just ignore it.