I had this issue with build 20110329.1 (ubuntu desktop i386) in a virtual machine (Virtual Box)
When one selects TRY UBUNTU, you get a 'blank' desktop with only the possibility to install ubuntu.
After installing ubuntu, when you boot for the first time, you get a blank desktop. After resetting the virtual box, the panels are displayed
I had this issue with build 20110329.1 (ubuntu desktop i386) in a virtual machine (Virtual Box)
When one selects TRY UBUNTU, you get a 'blank' desktop with only the possibility to install ubuntu.
After installing ubuntu, when you boot for the first time, you get a blank desktop. After resetting the virtual box,
the panels are displayed