The full changelog for the 17.2.1 patch remains unknown as the only revealed change is the fix of the freeze on social media screen. It's a relative large update though (112MB), so naturally there should be more changes included, possibly in match engine and scouting.
Released: 10 January 2017
As usual the update is save game compatible, so you don't have to start a new save game to apply the fixes.
To update you will need to close down Football Manager 2017 and re-launch for it to update. If this does not work for you or you feel it has not updated you will need to restart Steam.
Even if that doesn't do the trick, then verify the game cache will.
List of changesSTABILITY & PERFORMANCE
- Fixed freeze on social media screen
For any feedback in regards to this update, please use the official FM17 Feedback Thread (requires free membership on Sports Interactive forum).