I tried just a directional light as well and I still have the same issues! I have come up with a work around though but just using three spot lights gets me this, which I am happy with - Thanks for all the help guys, PC is awesome <3
Try clearing the lightmass swarm cache. It solves oddities like this sometimes. Either by clearing the contenst of the swarmcache folder in your UDK/bin folder or inside the swarm coordinator utility that pops up when building lighting.
Ok so I have cleared the cache from the interface and via windows. That didnt fix it! I changed them to point lights and got this - Then I changed the radius so they were not overlapping and got this - Also since clearing the cache over parts are going wrong! I think my lightmass is super broken!
Try checking the properties of your meshes in the Static Mesh Editor (double click in the Content Browser) and seeing if the Lightmap Coordinate Index and Resolution values are set properly. Remember that Index 1 in Unreal is Index 2 in Max. It's a long shot, but these issues may be a problem with overlapping or dodgy…