Just for the record: My workaround with Cubase 14: open PortSetup.xml and add "<int name="Hidden" value="1"/> " for all faulty MIDI devices, like :
<item>
<string name="ID" value="O|Windows MIDI|FW 1814 MIDI"/>
<int name="Hidden" value="1"/>
</item>
does NOT work with Cubase 15 anymore. It seems, that in Cubase 15 all MIDI drivers are loaded BEFORE checking if they are disabled. Thank you for that, Steinberg - great move…
It would be VERY easy to avoid problems with old(er) device (especially combi devices Audio/MIDI) to have a blacklist in Cubase to avoid loading selected drivers BEFORE starting them…