Why doesn't my App store work after upgrading to 6.0

Question

IPad 2 wifi
Just got it back from the shop and they did a reset.  When I was updating the IPad so it had the apps I wanted, one of the apps stated I had to have 6.0.  I thought why not.  Since the update, I have not been able to see my list of programs in the App Store under purchased.  It cycles for 5 minutes and then shuts down the App prog.  Took it in to the Apple store and they did all sorts of things to it (mostly through information provided through the communities, Not Apple) and said I had to restore it again.  Wipe and restore it and now it has no Apps other than the original and my list of downloaded programs are still inaccessible.  All other functions of the App Store program worked.
Just as a funny FYI, I downloaded the updated 10.7 ITunes to my laptop and it doesn't have access to my account either.  Just cycles and says the web site cannot be found.  Have another computer with 10.6 and the list works fine. 
So now in order to find out what I had on my IPad, I have to either wait for an update to unscrew this mess, or downgrade to 5.1.1 (which isn't available through apple), or go through a list of 4000+ apps and games and hope that I can find the ones that I had before.
I am used to this kind of crap through a PC based system so I learned to make backups.  I guess I need to start learning if apple has a way to do that now because they are as screwed up as PC's.

Answer 1

I would suggest deleting the Safari Preference Files and Caches.
To do this:
Go to Apple Menu Bar> Go> Library. (You must hold the option key to have the Library option be shown in the menu).
Then go to the Caches folder and look for a folder that says "com.apple.safari" or something similar. Drag that folder to the Trash.
After that, go to the Preferences folder in the Library and look for a file called "Safari.plist" or something similar. Again, drag that file to the Trash.
Close the Finder window and relauch Safari.
Hope this helps!