You can use overlapping UV's but you want your light map channel (normally the 2nd UV slot) to be uniquely unwrapped. If you don't have a second UV channel created I think it copies your first, which might be the problem you're running into? You can create a second channel on your own or have UDK auto unwrap a 2nd channel…
Some are a bit old, or are bug reports that have been fixed already. Also I think I use the app a bit differently thatn then now. But still! Topogun1.3 notes-ALWAYS SAVE BEFORE HITTING THECTRL KEY !!!-NEVER CTRLSHIFT TO ADD SELECTION !!!-Load reference-Right click switches between move mode and creation mode-Viewport…