I've recently installed 1.9.0 after uninstalling the version prior to 1.8.0. I had 1.8.0 but uninstalled it because my shows weren't being identified.
1.9.0 seems to identify shows better but my recently recorded shows aren't being identified. Older shows (1+ months) are identified correctly (at least it appears that way, haven't check yet because I have 500+ recordings). All of my recordings are located on a file share on a Windows Server 2012 machine.
I have included the "unidentified" header item the wmc interface so I can see what hasn't been identified and I've noticed that right before the list of shows is shown, a popup appears saying "The Recorded TV HD Service is running but might be stuck if "<recorded show name here>" is a regular recording."