Quote from chrisotherwise
I installed TabbyChat today and it's working great apart from one problem.
After about 15 minutes suddenly I find that pressing "o" instead of Ctrl-o brings up the TabbyChat options
when I'm in chat mode. After that, I can't type the letter "o" at all without bringing up the options box so
it's almost impossible to type anything. Any idea what might be causing this? I'm on a Mac OS-X 10.9.2.
I've experienced very similar issues to this on Linux myself, although not on Windows. I believe the source is LWJGL. I know the same issue with OSX has been reported here several times. I'm not sure there's been a fix or workaround nailed down, but with some monkeying around, you should be able to get it to go away whenever it crops up.
Basically, what happens for me is this - on Linux (Ubuntu specifically), when I use keys to execute special desktop shortcuts (e.g. Alt+Tab to switch windows, or Ctrl+Alt+Down to switch desktops), sometimes LWJGL and therefore Minecraft get hung up on those keys being held down when the window becomes active, and never realizes that I let it go. When this happens with Alt+Tab, usually I'll just Alt+Tab to some other window and then click on the Minecraft window to re-focus it. Then, usually my keys are "un-stuck".
It's just something you have to play around with, I'm afraid. The older version of LWJGL that Minecraft used to use tended to get the up/down keys stuck during gameplay, so at least that bug has been resolved