Well, now that I've played a little more I and every other member get the same error if we post a link, or use bbcode tags for url or images.
I really don't understand what went wrong, this box has been purring like a kitten for over a year with no problems what so ever.
Wait... I did do ONE update...
I updated Cyb-PayPal Donate from 4.7 to 4.8. It's located
here. I rolled this back to version 4.7 and the error remains.