Nevermind. It seems even though the Publish button doesn't "light up", it can still be clicked. In that case, this can just be considered a minor cosmetic issue - as the button remaining "greyed out" when an arc can be published can be confusing.
Thanks!
I have several AE arcs (that I managed to save over the years from before NCSoft shut CoX down) that have no errors, yet the Publish button is greyed out. I currently have 0/3 arcs published, so I haven't reached my limit on that. I've even created a new arc, also currently without errors, that the Publish button is greyed out on. Any help on this would be greatly appreciated! If needed, I'm on Torchbearer.