Just today I've noticed that when I go to log out and hover over my username like normal, then move my mouse to the log out option, the drop down disappears before I can select log out.
I have to visit my profile and select the "sign out" option.
The problem happens to me on all pages requiring I use the drop down to log out.
Windows 8, Chrome,
Should be latest flash version I like downloaded chrome+flash not too long ago