Dimensions can't rotate?

I don't even know how to describe this, other than to justshoot a video.
Any idea what causes this?
We have 3 new machines specifically purchased to overcome theproblems we have been having with SW.
The new specs are:
Dual Intel Core 2 Quad Q9300 (2.50 GHz)
3.5 GB Ram
Nvidia Quadro FX 570 6.14.11.7813 Driver
Win XP Pro, latest service packs and updates
SW 2009 SP 1.0

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