This is Windows 11 21H2 (build 22000.675) and Start11 1.22.

No change. I can easily reproduce by right-clicking the taskbar and selecting Task Manager.

I tried to record a video but this is difficult since the secure desktop isn't captured and my UAC prompts display on the secure desktop. The problem seems to only happen when I have a window snapped to take up half the display (like when you drag all the way to the left or right edge).

I believe I've nailed down exactly what's causing this after creating a new user.

I like having the "focus follows mouse" setting enabled, which can be accomplished like in this article: https://winaero.com/enable-xmouse-window-tracking-windows-10/. I have ActiveWndTrackTimeout set to 0. It seems to be a focus issue.

This is not an issue with Start11. I can confirm that I do also see the issue with the standard Windows 11 taskbar. (Presumably the behavior was different in Windows 10; I don't remember seeing this previously.)

I'm guessing I can work around this by setting ActiveWndTrackTimeout to a small non-zero value, but I'll give it a try when I have more time.

Thanks!