Crash while following the tutorial steps

Hi,
just going through the tutorial … when I was asked to switch to “Alhambra” (and then return to “Beginning”), I just tried to switch back using the common Alt-cursor-left shortcut (just like in a browser etc.). Then the Corkboard opened and then, after another Alt-Cursor-left the Program crashed. I could reproduce this behaviour several times, sometimes I had to hit Alt-Cursor-left twice (with the corkboard view activated) in order to achieve the “desired” crash.

Best regards
polyhis2011

Vista Home Premium
6.0.6002 SP 2 Build 6002