Letter i was highlighting entire line on my Mac

Just solved a very weird problem on my Mac.

When I typed the letter “i” the entire line would get highlighted. Basically my Mac had become useless. I envisaged days or weeks of lost productivity whilst I sent my Mac back to get a replacement.

It turned out to be a setting I’d enabled in Accessibility > Mouse & Trackpad > Enable Mouse Keys.

Why had I done that? To solve another bug on my Mac where the cursor disappears on external monitors. There seem to be several of these ongoing bugs that have never been fixed.

http://osxdaily.com/2013/07/19/disappearing-mouse-cursor-mac-os-x/

https://apple.stackexchange.com/questions/321447/mouse-cursor-disappeared-on-external-display-when-rotated

 

 

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