Edit: Solved by upgrading to 4.4.4.1200
Same issue. I had 4.4.4.6 for a few days before I got it. Uninstalled and Downgraded to the latest (4.4.3.4) stable version, same issue.
My proxy is off.
UserAgent has never been touched (default one in a grayed box)
Uninstall/reinstall didn't help
Win7 64bit