Bluetooth icon in Audio MIDI Setup (AMS) has disappeared

I've just upgraded to High Sierra 10.13.2 and can't install all my bluetooth MIDI devices which I normally setup by going to Audio MIDI devices.

I can't seem to find my devices nor the icon. However, I'm able to see them under Bluetooth settings but they are unable to connect.

How can this be fixed? Or has the setup changed?

I've uploaded a picture showing this.

Thanks in advance!