[HueyHq]

I thought I read there was some improper nfo tag used by ember/MC (at one point or another) for TVShows that caused XBMC to ignore any further importing.
So initial/first scrape of a TV Show would import properly, but if it was only a partial season and you added the missing episodes XBMC would fail to scrape them (even if MC/ember nfo was included/added).
Maybe this was an ember issue? Or not related to this discussion at all lol

You are correct; this was when the TV ID tag switched from IMDb to TheTVDb ID. This was some time ago now tho', so shouldn't be a problem now for new episodes (provided the show is ID'd properly).

No, the only thing I had setup Sickbeard to do was to notify XBMC of new episodes for tvshows that I had previously scraped using MC. However, the new episodes never appeared in XBMC.

OK, so it has become apparent that this is going to take a bit of effort to rectify. Could you please go over to the MC Codeplex site and log an issue? We gonna need more specific info about what is going on, I think.

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[tried with and without 'Use XBMC "TheTVDB" Scraper' - same result. Also tried overwriting old "instalation" of MC and making new folder with clean instalation of MC. When I hit search for new episodes or right click individual show and search new episodes MC finds new episodes, scraping shows for a very short time but nothing gets scraped. Did not have this problems with MC 3.4

Clean installation is good. Without XBMC scraper is good. No scraping is bad.
When you say MC 3.4, do you mean 3.400 or the latest beta (3.435b)? Just on the off-chance, 3.500 needs the .NET4.0 Windows update.
Could you please raise an issue at the MC Codeplex site (link on first post) if you are continuing to have problems.