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We were evaluating the online demo and found bug in the Left panel's GUI. when you see the interface in full screen mode the left panel GUI background repeats, giving an unimpressive look.
Did you try to reload. Sometimes browsers don't resize when you change their size. A reload should fix this. IF you can recreate it each time file a bug here:
Bugzilla
Wiki
Source
Full Screen GUI Bug in IE6.0 
Linear Mode
