Hey Lobo and Cybermonk,

I experienced this as well.  I thought I accidently hit some key strokes that activated F12.  I don't remember what I was doing at the time, and I did not think it was a bug until I saw this thread.

Have either of you reported it as a bug to the bug tracker?

If I can replicate the bug I would like to report it, but I have never stumbled upon a bug in Blender, so I have yet to report any.

How does one go about reporting it?

Do I need to create a special account, or can I use my BlenderArtists log-in for submitting?

Oh, and regarding the pie-menus with other themes; I am using the Hexagon theme, and I haven't experienced anything different with the menus.

What exactly is not working properly?  I will be on the lookout for any oddities, so I can report those as well.

For environment differences to help troubleshoot, I am not running any installed versions of Blender (all from folder), and am using on Windows7 and XP.