I recently upgraded to SolidWorks 2012 32bit and experienced enough of a performance lag that I bought a 64bit PC with Windows 7 64bit and re-installed Solidworks 64.  The preformance increase is nice, but now I have another, very perplexing issue.

Every time I change modes (eg, go into and out of sketch mode, or edit a feature) I lose the graphics view.  The screen goes blank.  I can restore it by right-clicking and selecting View.  Then it goes back to (almost) normal.  When the screen is blank, I can see that in fact what has happened is the graphics window has squashed itself down at the bottom, just out of view.

Like this:

See how my toolbars are gone and there is something (a sketch, I think) at the bottom of the screen.

I restore the view by clicking View, though I'm not sure what View really is supposed to do:

Once the view is restored, a vertical space is added at the top.  Every time I go through this (every time I change modes), more space is added.  Here you can see the space I am talking about after about three instances of this:

Can anyone tell me what is going on and how I can fix it?