No MIDI thru in 2019.5 and High Sierra
 

Just upgraded to PT 2019.5 Ultimate on a HDX system (see system specs below). I upgraded to 2019.5 while Sierra (10.12.6) was installed. Everything was working.

I upgraded to 10.13.6 (High Sierra) and I lost MIDI thru functionality. I can play MIDI back but not trigger from controller keyboard. I reinstalled the MIDI drivers and MIDI I/O does show up properly connected in MIDI setup.

On MIDI input device, the keyboard is missing even though it is connected in MIDI setup.

Does anyone have a clue? Thanks in advance.