I have had this problem for about one month with my itunes store. I get a blank white screen. Tried upgrading to latest version (11.0.4 now) but nothing seems to be working.
Here's the screenshot
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In order to get it working, I installed all my updates one at a time (instead of all at once since I was having a problem with updates installation).
Are you using Snow Leopard? Update the Safari then it will show.