Missing Series

I have DVDs of several TV series. I have encoded each of them using the same program with the same settings. When I browse the Series folder using my Sony SMP-N100 or my Panasonic DMP-bDT220 I only see one series. All of the files are in the same folder as well. When I browse the folder I can see the files and play any of them.
The one series that it is showing under the series folder, Stargate Atlantis, was not showing one of the seasons. I had not input all of the metadata or adjusted the file names for that particular season but they were all marked as TV Shows in iTunes and they were marked as being season 5. I updated the episode name & number and updated the file names this morning and that season shows up now. I checked the metadata for Star Trek, Firefly, Stargate SG-1, etc. and all the files look to have all the same metadata - season, episode, title, show, etc.
Do the file names needs to be in a certain format? Is there some magic piece of metadata the Atlantis files got that I've missed on the others?
Thanks and I apologize if this has been covered somewhere before. My searches turned up nothing relevant.
The one series that it is showing under the series folder, Stargate Atlantis, was not showing one of the seasons. I had not input all of the metadata or adjusted the file names for that particular season but they were all marked as TV Shows in iTunes and they were marked as being season 5. I updated the episode name & number and updated the file names this morning and that season shows up now. I checked the metadata for Star Trek, Firefly, Stargate SG-1, etc. and all the files look to have all the same metadata - season, episode, title, show, etc.
Do the file names needs to be in a certain format? Is there some magic piece of metadata the Atlantis files got that I've missed on the others?
Thanks and I apologize if this has been covered somewhere before. My searches turned up nothing relevant.