I think, to test it always best to use those default skins that come with WB. From there, if it still appear, than, we know its not skin related. If it only appear on some skin, than it is most likely skin related. Try and see if the issue appear on skins like diamond, acrylic 7, corporate. Use those skin that come with white clear taskbar while you on dark mode. If the taskbar don't paint properly, you can easily see it dark taskbar instead a white/lite one.
Stardock Community Assistant
Okay, to address several previous questions:
1. test with default skins: I just did that; the default skins *do* seem to work fine, including all the ones that you name above.
However, any user skin that I load, just leaves the previous taskbar in place... that also explains why the taskbar gets shifted off the right side of the screen - because the Start Menu button on those other skins is wider than the default button...
2. am I using any other configuration utilities besides WB? The only other custom utility that I am (or was) using, is Open Start Menu, because Start11 lacks important features that I require in Windows.
However: I uninstalled Open Start Menu (for testing these issues) and rebooted, and these issues are still present... so it does not involve that utility, and no, I'm not using any other customization software
2a. Does WB11 actually *require* Start11, in order to function properly? That would be very unfortunate...
3. Reinstall Windows 11?? *NO*, I am not going to muck with a working laptop and OS in order to (possibly) fix a bug in WB11 !!
I *think* that addresses all pending questions?