Today while playing around with the 20120605 snapshot I experienced some system utility crashes. I'm using LXDE in Virtualbox without guest tools on a single core with 1GB of RAM. 

First: The Warden. I tried to create a new port jail on the warden, at some point during the download it froze. when I tried to close the window it gave the not responding - end process prompt which I clicked, however the windows did not disappear even after an extended length of time. 

While that was happening, I played around with the control panel. I clicked the desktop manger selector in the control panel and clicked the option for KDE (which I do not have installed). At this point the control panel window also hung and when closed, gave the same end process prompt and then failed to close. 

I logged out of the system at this point and upon logging back in was unable to reproduce the crashes. If they recur I will report further.

Ben