Advanced Social System

About the error, have you parented your MPTopDownPlayerState to SocialPlayerState?

As for the window not loading for clients have you merged the HUDLayout. So the SocialSystem widgets are added into your MPTopDownKit’s HUDLayout (I know I should have named that file differently in my three assets… my mistake) and then you update the reference in the Client_LoadPlayer Logic.
It seems weird that it works for the server but not clients. That makes me think the Social Systems Init is only running on the server. Do you get any warnings or errors in your log?