If you downloaded DisplayFusion 12.0 and are having issues with languages please re-download and re-install. We have repacked the release as 12.0c with the languages fixed.
Suddenly had my DF Beta 8 stop responding on the second monitor taskbar. My main taskbar also stopped responding, then after a few seconds DF second taskbar closed and DF went away.
Restarted DF and seemed to be fine. Just installed Beta 9 to see if it happens again.