After updating two distinct Macs (a MacBook Air and a Mac Mini, both using the same iCloud account) from Mavericks to Yosemite, I noticed the following weird bug:
All keyboard shortcuts in Safari and Firefox (not in Chrome, nor in any other app I've tried) have stopped working. When using a shortcut in Firefox, the corresponding spot on the menu bar is briefly highlighted (for instance, ⌘T flashes File), but nothing else happens; in Safari, not even this menubar flashing occurs.
Weirdest of all: on both browsers, if I first open a menu by clicking on the menubar, then any shortcut works (while the menu is open).
Question: Has anyone else encountered this bug? What would you recommend? Should I notify Apple somehow?
Best Answer
I have had this exact problem for weeks, and it's been driving me crazy, but I've finally found a solution. I found this thread on the Apple Support Communities, where “stevendeluxe” says the following:
I did the same, went to “Language & Region” in OS X System Preferences (found in the Apple menu at the top left of the screen), and removed two languages I'd added as a lark (Swiss German and Klingon, to be precise), and after restarting the computer (which OS X requires if you remove the primary language), all my keyboard shortcuts work again. Joy and jubilation.
I hope this works for you, too.