The latest update for the Master Chief Collection has launched, and fixes these systems: Source: [url]https://www.halowaypoint.com/en-us/community/blog-posts/3-3-15-halo-the-master-chief-collection-content-update-notes[/url] [u][b]Matchmaking:[/b][/u] Made a variety of updates to improve matchmaking performance and success rates Improved matchmaking search times/time to match Improved stability throughout the matchmaking process across all titles [u][b]Parties:[/b][/u] Improved party stability [u][b]Halo 2:[/b][/u] Made improvements to multiplayer shot registration Improved campaign stability across a variety of levels Addressed stability issues for matchmaking and custom games Fixed issues around resuming H2A Campaign from “remastered” mode Improved medal display consistency [u][b]Halo: Combat Evolved:[/b][/u] Fixed issues regarding aim assist which resulted in the reticle being pushed away from an enemy Improved shot registration consistency between host / client in peer-to-peer custom game matches Resolved a variety of UI inconsistencies, including team color randomization, medals, and in-game scoreboard display EDIT: If your version of the game was not working, please comment on whether or not the update fixed the game for you!