AJ I was just getting this error to. I could not fix it, so I just re-made the map. Or re-built it.
I am also running into a problem, I posted it everywhere but no one is helping me, maybe you can AJ?
It's a simple problem, and I belive our problems are related in some way, I took the time out to create a video on the problem I am having.
http://www.youtube.com/watch?v=MyxPm3wMGdg
It shows me creating a fully stock media map, and having my beta tester host it. Then I would join, it crashes immediate as you can see. To help reproduce the problem, I also hosted a game and made the tester join, he crashed the same way. This has been going on for awhile. Of coarse I am using 1.17, but I was also getting the error 302. I would like you to create a simple stock media map, and let me try and join it. We will do vice versa, to see if the crash happens as well. If it does, I would appreciate you sending an E-mail to lee telling him that you confirmed it with me.