A small Windows setting is likely hiding your cursor at the worst possible time

A disappearing mouse cursor can break your flow and feel completely random. This piece explains why it happens on modern Windows laptops and walks through the one setting that reliably stops it.
KahawaTungu

How To Get The Cursor Back On A Laptop

Most laptops have a touchpad toggle key. The cursor often reappears immediately. A simple restart can fix many problems.
AOL

Why does my Mac's mouse keep disappearing? How to fix a mouse cursor that won't stay on the screen

If the mouse keeps disappearing on your Mac, make sure that it's connected, and the cursor isn't too small. You can quickly find your cursor by shaking your Mac's mouse, which will cause the cursor to ...
Ars Technica

My cursor keeps disappearing, dammit!!!!

This is starting to piss me off. I have two monitors connected to the GeForce4 that came with my MDD 1GHz. I'm running OSX 10.2.5. My primary monitor is an Apple LCD screen. I have a 17" CRT connected ...