I can not recreate this on Linux either.
Here is exactly what I am trying:
1. Make sure my default browser is not open or running.
2. open our latest Sigil User Guide in Sigil (which has 2 stylesheets)
3. in BookBrowser I highlight both css files and then right click and select "Validate with W3C"
4. I wait and a browser window with two tabs open and both say pass.
This works on Manjaro Linux with FireFox or Chrome as the default browser, and it works on MacOS with Safari as the default browser.
So whatever is going on must be Windows specific and interfering with both stylesheets being validated.
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