This just recently started happening. Some Text that was previously readable now is displayed with all Xs . This is in many places including manage passwords, printer selection and google docs. If Hi highlight and copy the Xs and past in another program then the text displayed is readable again, and if I copy that text and paste again in browser it is ledgible.
That sounds like a Windows font file may have become corrupted.
When that happens you can't read the text using that particular font, you just see strange or random characters instead, - but when you copy/paste the text into something that's using a different font then the text becomes readable again.
I would try rebuilding the Windows font cache to see if that fixes it, see here:
<a href="https://techcult.com/rebuild-font-cache-in-windows-10/" ipsnoembed="true" rel="external nofollow">https://techcult.com/rebuild-font-cache-in-windows-10/</a>