Just so you know, I just tested with another machine, W10 1803 (so not the same version as my main which is 1809), and I don't have the bug #2 (white background on tab bar). I have #3 (white border around tabs) though.
I just tested it on Win10 (1803) and it looks good. The tab borders are from the theme and they are indeed brighter than in Win8.1. I will take care of this in the next beta...
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Don, once again I've discovered that just now because I wasn't using XYplorer Classic Style before, but: in thumbnails view, the selection box background isn't drawn behind the file name. I think it looks better in Windows Theme Style because there's not a "hole" in the selection box where the file name is displayed: