If you have created custom maps or modes on Halo: The Master Chief Collection before December 3rd, the content will need to migrate over with the latest update. Upon launching the title for the first time, you will notice a Migration Loading Screen.
In some instances, users might notice the screen disappearing shortly after appearing or a black screen appearing instead when launching the update. It can resemble the game being entirely unresponsive and not working. This is not the case. The migration is still occurring in the background and we recommend users let the process complete.
If the migration is interrupted by a restart of the client, the process will repeat upon re-launch.
Please allow the migration to come to a completion at which point you will be able to interact with the menu.