"Failed to authenticate"

Ahh now it all makes sense. Seems Proboards recently added extra security (a random string element) to the modify HF page. If you're in the habit of opening two windows/tabs to the HF in order to quickly undo an edit if a problem arises that might no longer work since each page load generates a new random string which is used to further authenticate the submission. In other words submitting on any page except the most recently opened HF will give you a "failed to authenticate" error.

I never connected the dots but I did notice the addition of random element and in particular its role in causing the Crossfury code to stop working due to its placement.

If you have more than one tab or window (in any browser) open to the headers/footers (note: Crossfury uses headers footers page but modifies it so that counts too) then submitting on any tab or window except the most recently opened one will give you a failed to authenticate error since there is a random hash generated with every page load now. If that hash doesn't match the one the server last issued for the site then you get that error.

It is also that new random hash element that the second patch moves since it is in a spot on the page where crossfury doesn't expect it causing crossfury to fail.

My guess is this new feature was implemented to address the case where several people have access to the headers/footers and if they are simultaneously editing codes and save changes seconds apart the last save would overwrite any changes made just seconds earlier. With the random hash the person with the old HF data would need to refresh to make any changes (which is a good thing).