I fired up my computer yesterday and the problem disappeared. Pretty sure I didn't do anything that would have changed anything...

Maybe the latest Win10 update fixed it, for now.

Its the default theme but I've changed the background to do a rotating slideshow of a folder of pictures. Its one of the first things I do, and this problem doesn't come up for a while after that

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It usually takes a little while, but at some point this little gap in the taskbar appears and the only way I've ever managed to get rid of it is doing a full reinstall of Windows. Then...