Registering players after deadline?

How come very time I ply this game and sign someone on transfer day at 1900 he can't play until January because he player registration message came at 7pm and has closed? Surely you should be able to register players up to midnight?

Unless you get the message "transfer deadline has passed" you should be able to sign the player. If not, then it's another bug.

How come very time I ply this game and sign someone on transfer day at 1900 he can't play until January because he player registration message came at 7pm and has closed? Surely you should be able to register players up to midnight?

Just because the player registration message arrived at 7pm doesn't mean that is the final registration time. You can register a player anytime up to the closure of the window from within the squad screen.