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In lieu of forums (which are a critical support resource and I'm surprised are unavailable during a release), I upgraded from v7.0.6 to 7.1 last night. The upgrade went ok but I encountered many problems:
The logon control reported an Unknown Error. I had to disable Active Directory authentication to fix this.
The admin bar would not show its drop down menus (i.e. Edit Page) when on pages with the DarkKnight Home-Standard-Menu skin.
The Document Library broke on one portal, only showing 'Empty' in the folder selection.
There appeared to be issues with jQuery.
In the end there were too many unrecoverable errors so I had to restore the database and filesystem from backup. I've never encountered so many problems with an update before and it's disappointing that this release seems so buggy.