So, last weekend I got a Mythic code from a Limited Edition Halo Wars, and I played the maps fine that weekend. Then this weekend, I try to load one of the maps, and it says "players failed to load content". So I checked the solutions that Bungie provided in their news post, and spent a long time on the phone with Xbox, and I couldn't fix it. But then I realized it wasn't just a Mythic problem. Not one of my maps will load, nothing in multiplayer or campaign. Is this a frequent issue, or more importantly, is it an issue that can be solved?
Playerhata27 recently had a similar problem. Have you tried to delete some custom content? The maps won't load with too much custom content.
That's strange, that same particular problem is happening to one of my friends too. And I didn't even know about Playerhata not being able to play on the maps.