Done some more investigation and the 0/empty episodes are clearly just examples of a more general display problem. There seems to be a problem with the indexing of the list in some way and if I list the entire database showing all TV Episodes (2,305 items: 805 movies, 1,480 TV episodes and 20 Music Videos) there are several incorrect mappings/entries. I have attached a picture showing just one example where the list says it's Medium Season 7 Episode 1 and the details Terra Nova Season 1 Episode 1. If I do a search on Terra Nova Season 1 using the new search facility, or double click on a green entry when Episodes are NOT displayed to open the season Listing screen the 'Medium Season 7 Episode 1' entry appears where the Terra Nova one should be in the results lists.
Is there some way of completely regenerating the index without recreating the DB? Compacting appears to have no effect.