sadly i didn't find a way to fix my problem, so maybe at the snow release some maps will look like they have destroyed lightmaps...
Skyslide helped me to create right lightmaps in blender and if I look at them, there are no problems... I unwrapped it right at the right edges, but ingame it looks completely different...
I already cleared cache, calculated and calculated lightmaps, but it's not better...
Here is an ingame-result, which shouldn't look like this..
http://i.imgur.com/BPYC1dS.png
I have other, worse results, where the objects are black at some parts too.
It's a finish object and looks like this in blender: http://i.imgur.com/VGSFCzC.png
As you can see, the edges are marked red and the lightmap in blender is okay too: http://i.imgur.com/atEQazD.png
nothing is overlapping and the faces are in the right shape.
So i hope i can find help until the release


Thanks in advance,
Flo