This problem has bothered me for a few months now, but only in very limited circumstances. When I went on medium.com and tried to access my profile, when I clicked to open the navigation, the box dropped down for less than a second before disappearing.
Even worse, the menu doesn't even appear at all every click. It's about every other click, but I don't think exactly. Double clicking has mixed results, but none too promising. I tried in Safari with the same results.
The even more annoying thing is that in Chrome, I can't left-click on any extensions to access their menus, at all.
And I'm not 100% sure if this is related, but I've also been having issues installing certain applications, including Wireshark and TrueCrypt 7.2
When I opened the installer, I get two instances of the installer, each of which stall and never finish the initial file verification process (before I can even start the installer).