I have had times when setting up a channel where it gets stuck in kind of a cached status. It's like no matter what you do it doesn't take any changes. What I have done is to use a new json file for the URL , force it to accept that one, then change it back to the one that you are making changes on.
I know it sounds like a long way around it, but sometimes by making a drastic change when you go back to what should work it does.
Thank for the input Tim! I'll give that a try in the morning. That's about the only trick I have no tried yet. Did you have this problem with direct publisher? I'll let you know how it goes.
UPDATE: I tried the suggested and switched the feed urls back and forth, but I'm still getting the submit error on the BRANDING page. Even on 2 different work stations and across different browser platforms. I'll keep searching and bugging
It may have something to do with the unpublished channel being evaluated for monetization, I don't know?