^^^ Thank you for the pointer. After digging around yesterday, I may have found what the issue could be.
I point my library to the the NAS folder on the network and also have this folder mapped on my htpc. There have been times when a new folder does not show up in library immediately and at that point, I add this folder manually in MC library by right clicking in explorer and import to MC. Some of these folders when added through explorer are tagged incorrectly and are not playable in Theater View. I would like to delete all the folders that were imported in the library through mapped folder (V:\Movies) and re-import them correctly through the network share (\\tower\Movies).
Now the question is, how to fix this? The last time when I deleted a folder from library that was tagged incorrectly, I could not re-add it. Is there a clean way to fix this so that all media in the library is pulled in only from the network share directly (eg //tower/Movies) and not a mapped folder (eg V:\Movies)?