This sounds more like a CSS Error somehow. Have you gotten this error when disabling extensions too? Is this using Light Mode or Dark Mode? I personally do not recognize YOUR problem, though I've got a DIFFERENT “URLs not working” problem; perhaps additional information will help accelerate a way to solve whatever problem you are experiencing? Do you mean you cannot [text](URL), example: [Roll20](<a href="https://www.roll20.net" rel="nofollow">https://www.roll20.net</a>) or do you mean you cannot see a URL in Chat when just plain pasted into chat, like this: <a href="https://www.roll20.net" rel="nofollow">https://www.roll20.net</a> because, MY issue involves using a “(” or “)” in a [Text](URL) section's URL portion, because there are URLs one might want to link to cleanly where the URL includes a “(” or “)”, but the URL's “)” will break the URL Parsing Engine on Roll20; so, you might want to edit your Title to include a little extra description beyond just “URL links not working”.