As a software developer, I’ve occasionally felt ashamed when it takes me hours—or even days—to fix a stubborn bug. But whenever I see that even big tech companies struggle with similar issues, I regain confidence in myself. After all, this is what being a software engineer often looks like: wrestling with unpredictable behavior until something finally clicks.

Just yesterday, I ran into a bizarre bug on Windows where the mouse cursor would move every time I pressed the arrow keys—almost like I was controlling the mouse with the keyboard. It drove me nuts. I checked all the usual mouse and keyboard settings, but everything looked normal. At one point, I even wondered if my machine had been infected by a virus.

Desperate, I Googled "mouse pointer moving on arrow keys". The first result had only one answer, which blamed... Microsoft Paint. I was skeptical—Paint? Really? That couldn’t possibly be it. Still, with no other leads, I gave it a shot. As it turned out, I did have Paint open in another Desktop View, where I’d been cropping a screenshot. The moment I closed it, the problem vanished. Instantly.

I still can’t believe that was the cause—and I’m a little embarrassed to admit it, even though no one was around to see it.

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1. https://superuser.com/questions/1467313/mouse-pointer-moving...