I have gone and marked specific episodes within seasons for a show and then when I click the Search for all episodes in this series, it says it does a search but does nothing. This same method worked with usenet previously. I am currently on build 2.0.0.2427
I would also like you to consider making the whole season search apply to only marked episodes rather than searching for the whole season and ignoring marked wanted or not.
Have you tried going to the torrent indexer site directly, and do a search there to see if they have any episodes? If yes, I think markus and the rest of the dev team may need some more details like which quality, which show, … Maybe some logs as well…
As for the whole season search only apply to the marked episodes: I think the “cost” for requesting all episodes for an entire season is “cheaper”. It will be a single api call to your indexer to say “give me all results for season x”, rather than 5 calls for “give me all results for season x, episode y” if you had marked 5 episodes.
And then you do the “free” process of ignoring the ones you don’t want on the sonarr side 