I just tried to do an auto-upgrade on a client's WP blog. As soon as I hit the button the window went totally blank, and I haven't been able to access the dashboard at all since them.
The 'outside' of the blog is still showing up fine. It's just the dashboard area that's gone.
I have no access to the dashboard, so I can't disable anything to see if it's a plug-in problem.
Any thoughts on what might be happening?