I tried today the applink for blender <-> 3D coat.
wiki.blender.org/index.php/Extensions:2.6/Py/Scripts/Import-Export/3dcoat_applink
I need to say, that saved the day, and made 3d coat with blender usefull for me.
Now its also intressting to buy. Need to figure out a few thigs more.
But sofar am very happy. Only 3d coat program font keeps a bit to small for my eyes.
So for others if you have troube to get UVmap or object painted in blender, use 3d Coat with the applink.