I use a wireless Logitech trackball for RSI reasons. My wife uses a random dell usb mouse because she hates the trackball. We have a single Mac mini and use fast user switching to change accounts.

On both accounts, the trackball stops tracking. It'll move the cursor for a while and then stop mid-motion. The buttons still work.

On the login window, the mouse works. When I log in from there, it works for up to a minute. Then it dies again.

I had no issues with this mouse on my previous machine (linux) and the issue started immediately when I switched to this mac.

Equipment: 2014 Mac Mini running Sierra. Logitech m570 trackball. Generic dell usb other mouse.

  • 1
    Please edit your question to include your Mac model, OS version, and trackball model.
    – fsb
    Jun 2, 2017 at 21:28

2 Answers 2


I might have fixed this. Not sure yet, but it's been usable for a whole 10 minutes which is a new record.

The fix? I shuffled usbs until I found a permutation that works. Didn't think that would be a problem in 2017, but here we are.


I've had this happen too, also where I could move the mouse but not click. I always had to turn off the connected mouse, then turn it back on and that seemed to fix the problem for me.

  • I've tried turning it off, unplugging it, etc. No luck so far.
    – valadil
    Jun 3, 2017 at 12:48

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