mrcgkh: Replace "arcade" with "oldarcade" in the URL.
TonyW: Possibly an issue with the "Publish" step of uploading a new game, I've had the same screen at some point.
I clicked on the links in the left menu and went through all the steps a second time to manage to publish my last upload.
Can be worth a try to reproduce this way or confirm if it still doesn't work.
Thanks, I may have been trying to upload while it was being worked on... or possibility someone "fixed it",
at any rate I went back a few minutes later and everything is working and in order.