Mesh texture problems with actual viewer

[Sunga Blister]

After installing the newest viewer, I have the problem that mesh does not works correctly.

If I load up a mesh object from a dae-file, it is not possible to modify the faces of the object correctly.

Objects I loaded up in the past, are still working correctly. If I load up one of this older objects again, the new version of this object does not work correctly.

The problem shows as follows:

If I change the color of one face, all other faces get the same color too. 

If I put different textures on different faces, sometimes it rotates mor than the selected face.

If I put the object back into inventory all textures will be removed.