I also have had same symptoms. It has happened on me twice while using Chrome, I'd be on Gmail composing an email, I'll click on Attach File then click on a bookmarked folder and then it will freeze. Ctrl+Alt+Backspace will work and get me back to the login screen.
I also have had same symptoms. It has happened on me twice while using Chrome, I'd be on Gmail composing an email, I'll click on Attach File then click on a bookmarked folder and then it will freeze. Ctrl+Alt+Backspace will work and get me back to the login screen.