When I returned to my computer, after about 2 hours, I switched to the Logos4 screen and saw this.At first it was all blank. Then moving my mouse over the screen began to draw some of the stuff you see in this screen shot (reduced to 1/2 size to save space). This is a full screen shot.

A moment later, after doing the 1st screen shot I got this one (only right most pane shown).

The screen returns to normal after minimizing and restoring.
This is on my main machine, now running 4.0a Beta 2(4.0.3.3487). I did notice this on SR7 as well, but it was rare and I wasn't always in a work-flow place to report it.
System specs: Dell Studio XPS 435MT; Win7 64bit Home Premium ; 6GB DDR3 RAM; 465GB free HD space on C:\; CPU: Intel i7-920 2.67GHz (8MB L3 cache); Video ATI Radeon HD 4850 (512MB)