OMFG, I am so stupid it's embarrassing.
The reason links aren't working is because I added SSL about a year ago now which secures the transfer protocol changing url's from http:// to https://.
Unfortunately, nearly 20 years of typing http:// became muscle memory and I don't think of it when typing or editing links. The problem is, depending on browser, it can flag http:// links from an SSL certified site as unsecure.
All links have been updated to https:// and should now work without issue in all Browsers.
Sorry about that.