[Terminal]

In the web admin it's in Settings >> Advanced Settings >> Miscellaneous Settings. Although I didn't realize that would have anything to with if a show is marked as New or not. Have you manually moved them outside of BTV this sounds like the most likely option since you say they also are locked. Do you have the option set for different users to use different watch points? This will make it so that if you watch a recording under one user profile a different user profile will still see it as new. That setting is also under the same menu option in the web admin as the recent record days it's called User Specific Watched Points.