When you get the message above it should let you know what needs to be removed from the post. Sometimes a url will inadvertantly include filtered words, if you're including a url try posting without it first to see if the message gets through.
Hi and thank you for your quick response. IIRC there was no mention in the error message about removing "filtered words", just "Please correct the highlighted errors and try again.". I will have to try and recreate the issue as there are no notes of the issue.