We have had reports of players experiencing freezing when using L2 or interacting with the party memeber sidebar in any way. The team is aware and currently investigating the cause of this issue. In the meantime, we have found that disabling Performance Mode in the game settings should improve the experience for you, while we work on a permanant fix.

Alternatively, as the issue seems to be stemming from loading a save from a previous version, you can try loading your save file and saving again on this latest version. Then reload your new save and you may find that you are good to go!