Ran into this odd problem tonight where, suddenly, all widgets are missing from the sidebar and are un-editable in the dashboard. Additionally the admin bar on non-dashboard pages is gone. I'm using the Thesis theme, but I have this problem across all themes and have double checked the the header and footer are being called appropriately.
I've tried a fresh install of Thesis, and have deactivated every plugin. Not really sure what's going on, thought someone else could help in this conundrum since it appears to be outside of the theme itself.
The site URL is: http://www.mattjnzn.com
Thanks in advance!