I have a few thousand vertices in my object, and I select all of them. When I attempt to rotate around the X or Z axis, about a doze of them rotate in the opposite direction. The model is of a six pack of soda, and each of the sodas in the six pack was duplicated from an original soda. The original and 3 of the duplicates all rotate correctly.
Scaling and grabbing all work fine. Only rotating causes the problem.
I’m uploading a video to youtube demonstrating what’s going on. It should be viewable about 20 minutes after this is posted here: http://youtu.be/lnFQbX1TPiA (In the video, there is an armature there, but it’s not currently attached to the object, so I don’t think that’s the problem.)
Hopefully I’ve given enough info that more experienced people know what I’ve done wrong, lol. If not that video should help.