Hi Kris. Over the years I have had this error message a number of times. It has always been due to incorrect play by forum log in details. These can suddenly disappear altogether or be replaced by the details of another player, for no apparent reason.
Of course variance has already given this answer and you have attempted to address such a problem, but I thought it might help if I emphasised the same cause.
I should add that the simple work around of posting a reply with the game file attached will overcome this problem. This is the same approach as I have highlighted for overcoming 301 too, until such time as you have that fixed.
Even after the fix you will need to use this approach for 1.8 games anyway, as the 301 fix only works for 1.9 and games started in 1.8 cannot be switched to 1.9. As I said in a previous attempt to help you need to be clear whether you are using 1.8 or 1.9.
Which means there is no reason to delay 1.8 or 1.9 games while you apply the 301 fix for 1.9, or struggle with this refresher heading error. Just continue by posting a reply with the game file attached.
As I have said this before I imagine you need a helping hand on how to attach a game file to a post? If so do just ask.