Was playing through the Series playlist, finish Halo 2 and the game failed to start Halo 3. I figured out that the game was just stuck in the end of the Halo 2 end cinematic (http://tinyurl.com/nx9tb2g Starts black but skip to 0:15 for really creepy Cortana). Now I’m sitting at the startup screen after pressing start with no UI whatsoever. After waiting about 10 minutes I get the cannot sync saved data XBL message… Am I screwed? Do I need to start all over?
Seems to have fixed itself after opening another game then returning to MCC.