I have the same problem using a SteelSeries mouse (Sensei Ten).
The problems happens if I use two profiles logged in at the same time.
To solve the problem, I need to Log Off the faulty account, then Log back in again and all is fine (no need to Restart).
Still, I agree with all of you: this shouldn’t happen.
pcote
Users receive reputation points by contributing quality content to the forums.
Posts include post and replies published on the forums.
Post authors can mark replies as Accepted to indicate successful solutions.
Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solution