I was working on a drawing for an assembly when I went to rotate the assembly, it was totally gone. Everything in the tree on the left was visible but the assembly model was gone. Nothing was hidden or suppressed. If I rotated it just right I could see some of it but all the assembly parts were not where they are suppose to be. In the tree, all of the parts have been fully defined but yet in the model they are not. First I thought is was my video card driver so I had another employee open the file. He had the same problem with a totally different video card. If I opened the drawing associated with the assembly, all of the components are where they are suppose to be. I would like to attach the file but it exceeds the max allowed size. Up to this point I have had no problems.

Any help would be greatly appreciated.

2011 x64 SP4.0

ATI V4800

HP Z210