I had another issue posted in a different thread. http://wordpress.org/support/topic/widgets-wont-move-media-button-wont-work-kitchen-sink-gone-etc?replies=6#post-4228519
Seeing loss of dashboard functionality on two installs on same domain:
Advice from mod was to do a core re-install. That keeps failing, repeatedly.
It will start to load and then go to a 500 error. If you check the site during 500, you get "The service is unavailable." on a white screen.
It takes anywhere between 2 and 30 minutes for the site to come back again and I get a message telling me an automatic update failed and to try again.
Today, I got a notice from Google that my site was being listed as malware and pointed to an infected photo gallery. I deleted all of the images and the post for that gallery as a precaution.