Hey,
I opened the forums today in Chrome which is my usual browser. I was greeted by this message:
Sorry DudeRegular, you are banned from using this forum!
Spam will not be tolerated.
This ban is not set to expire.
I managed to get logged in ok by visiting the forum using Vivaldi, which I don't think I had used to access here before.
EDIT: Cleared cookies for the arcadecontrols.com domain and that sorted it in Chrome. Leaving this here in case anyone else has an issue.