How to fix macOS Sierra language switching bug?
Solution 1:
Go to system preferences/Siri and turn off Siri and make sure that the keyboard shortcut is set to None, and then restart.
Solution 2:
Had this happening to me every once in a while. Console did emitted an error when I attempted to switch the keyboard layout:
TypingFocusDebug senderProcess is non-trustable, senderProcessPID is 6171 typingFocusProcessPID is 35651 -> msgID = -1
The senderProcessPID was /System/Library/PrivateFrameworks/LocalAuthenticationUI.framework/Versions/A/XPCServices/localAuthenticationRemoteService.xpc/Contents/MacOS/localAuthenticationRemoteService
Killing it did helped to get rid of the non-switching input source problem:
sudo killall -9 localAuthenticationRemoteService
Hope this helps others who are having the same issue.
Solution 3:
Had a similar problem with the variation that I needed to change focus of the window (deactivate and activate currently focused application window by using command+tab, very annoying).
I am extending the solution with Siri (which I am not certain about if that is really solving the problem but I don't use it anyway) with what has worked for me:
- Turn off Siri in System preferences (reboot as explained by Tom)
- Use method with Select the previous input source.
- Don't use Select next source in Input menu
The difference in how those two methods (2) and (3) are implemented causes only (2) to work properly, since it shows a menu popup where user can loop over languages. This results in missing defocus/focus step.
Hope that helps!