Midi library not playing

Hello,
My problem is in Cubase 13 pro that the midi library is not playing as it used to when im choosing a sound.
Is there a way to fix it please?
Thx

Hi and welcome to the forum,

What exactly do you mean by MIDI Library?

What do you mean by choosing a sound?

Are you talking about the Preview in MediaBay? Or do you import a MIDI File to a project? Or do you do something else?