Still trying to track down this bug https://mastodon.social/@siracusa/110255326994000695

To review:

1. It happens only when more than one user is logged in.

2. It does not happen on a clean install of Sonoma—but it does happen on my actual install of Sonoma.

3. It happens even when the only two users logged in are two newly created user accounts.

4. No non-Apple KEXTs are installed.

Given all of this, I've been looking in /Library for culprits. Is there some other place I should be looking?

Important update to https://mastodon.social/@siracusa/110255326994000695

The bug *is* reproducible on a clean install of macOS 14.0 (23A344).

It was not reproducible in an earlier Sonoma beta, but that changed some time between then and the release version.

At least I can stop tearing third-party software out of my system now…

…but now it’s time to try removing some hardware…

(Reminder for Apple folks: this is FB12122106.)

I'm looking for someone with access to a 2019 Mac Pro (preferably with a Radeon Pro Vega II GPU) to try to reproduce FB13211706 as demonstrated in https://youtu.be/5Aq2GZpKkLU

Has Apple tried to reproduce it internally? I don't know. I've had no response in the Feedback app since I filed my original report six months ago. So I'm looking for a someone who is willing to actually communicate with me to tell me if it's just my Mac or what.

Oh, FFS…it's my mouse! My stupid Microsoft Precision Mouse that has already been replaced under warranty once! When I use my wife's mouse, it no longer happens.

My mouse is connected via a USB cable, and the issue reproduces on a fresh install of macOS Sonoma with zero third-party software installed. So it has to be a hardware issue with the mouse—a hardware issue that only manifests when more than one user is logged in and window dragging happens with other visible windows, which is wild!