[elusien]

Can you make it scan by bringing up the context menu on the show and scanning it?
Does your source folder still have content and scraper set?

I too have the same problem, even though I have 'UPDATE LIBRARY ON STARTUP' set. It's even worse in that it has problems if I install a new TV Series, by copying it off one of my DVDs. It doesn't seem to find it in the library. I have a workaround by re-scanning e.g.

go to the HOME -> VIDEOS -> FILES-> TV SHOWS
bring up the context menus for the TV Series and click on “SCAN FOR NEW CONTENT”
then bring up the context menu again and click on “TV SHOW INFORMATION”
Click “REFRESH” and click “YES” when it asks “REFRESH INFORMATION FOR ALL EPISODES'.

The problem exists on both Frodo 12.2 and the Gotham nightlies.

I'm gonna try a few experiments with debugging enabled and if I can't sort it out myself I'll report it, including the log of course.