Here’s a quick one… One of those face-palm moments that took me way too long to figure out.
I just spent 20 minutes trying to figure out why my mouse pointer would reset locations on my screen every second or two. I could move the mouse, but it would instantly jump back to the original spot (at the bottom of my screen). I’m in Apple OSX – though this same issue would affect Windows. Using only my keyboard, I tried shutting down every application one by one. Something in my computer was causing my mouse to disappear and move locations. After all my applications were closed, I tried relaunching Finder. Still nothing.
Finally, I try rebooting my entire machine. After it booted, the problem persisted. Becoming very frustrated, I turned off my wireless mouse and went to go to search for a wired mouse to try instead. That’s when the (very delayed) lightbulb went off in my head: my Wacom graphics tablet! Sure enough, I had placed my tablet stylus on the corner of my graphics tablet and it was fighting with my mouse, repositioning my mouse pointer to the same location on my screen.
In the words of the great H.J. Simpson: “Doh!”