Macbook Pro Mac left click fail
After much research on line, much of which complained about left click problems occurring after an update, I discovered why the integrated trackpad, desktop mouse and magic trackpad all failed to left click. Cursor movement was fine on all devices, and even right click worked.
Solution: The Apple Magic Mouse in my laptop bag was “on” and the mouse compressed (sending a continuous left click I suspect).
Turn the mouse off, and everything returned to normal. Doh!
Some dude with the same issue made a video to say the same thing: Mac left click not working The only difference is he realized turning bluetooth off fixed the issue.
Left Click on Mac should work just fine after you turn off the mouse in your bag! Best of all remember to turn it off when you are not using it!