I'm using a beta version of 5.6 on a Mac (Lion) and when I try to edit any demo page (e.g. English home page on Geometrixx Outdoors site) the screen is completely blank. Does not matter whether I use the new touch-optimized view or the classic UI.
I'm guessing this is a bug? Any workaround for this?
I am not sure which version of beta you are using. I tried with GA & looks fine. Could you please try with GA. Also did you noticied any error in log files.