[Solved, ports show in Mixer, just not in Track Inspector for some reason.]
VSL user here.
Trying for the first time to combine all orchestral instruments into a single VE Pro instance. In order to accommodate this I have increased my MIDI ports per VE Pro instance from 8 to 18.
But when for Cubase MIDI tracks I go to assign MIDI ports from the dropdown list, it only lists 9 MIDI ports.
Not sure whether this is a Cubase limitation or there is some way to show all available MIDI ports.