Had the same issue last night, and it appeared that the problem was with IE.
Tried the micrsoft IE fix - didn't work.
Tried restoring from an earlier breakpoint - didn't work.
Tried uninstalling and re-installing IE. - didn't work.
At that point I got out my laptop. Initially every thing was fine, but after a couple of minutes the same thing happened.
At that point I gave up and used Firefox.
This morning I discovered my desktop had uploaded a MS update overnight, and everything was working fine.