Dangerous newbie: How to set center of rotation on 3D view?

 From:  Ken (KCOREY)
6993.1 
Yesterday, I noticed that when I'd right-click drag in the 3D view, the point of rotation was off in the distance. As I rotated, the model would wildly scroll left and right.

I clicked on 'reset', and I was happily rotating around the origin (and middle of my model) again.

Today, I was experimenting with CPlane in View tab, and realised my model is no longer oriented on the plane I'd told it. Ctrl-Z didn't seem to have any effect on undoing this.

Through various rotations, I was able to get the model back to its correct orientation.

Is there a way to pick a new centerpoint of rotation? If I'm zoomed in and focused on a tiny part in one corner of the device, I don't want it to go walkabout simply because I'm rotating.

Thanks,

-Ken