Is there a way to force OpenPHT to play a series (Firefly, of course) in DVD order as opposed to aired order?
You can try to set the series by DVD order if you go to the series in Plex/Web and choose Edit -> Advanced -> Episode Ordering. Select DVD Order from the dropdown menu. Unsure if that would work but does not hurt to try.
I just tried this for Firefly on my server, and it didn't work. Do I have to restart the server?
You need to Refresh Metadata or nothing will change.