Solution so far (at least this seams to work for now):
Export as Collada file and replace the messed up models with my original ones.
The Collada file doesnt seam to have this weired 270degree orientation.

If someone knows a better solution please post it here. I cant be the only one having this issues....or do I?....tam... tam...taaaaaam!

cheers and have a nice one

Models, Textures and Levels at:
http://www.blattsalat.com/
portfolio:
http://showcase.blattsalat.com/