No changes have been made to the Movie Library for quite a while - and 1.16.3 is no exception here. I can send you a copy of 1.16.2 by email, if you want, but I doubt it will make any change, since the code is identical.

By default, Remote Buddy uses Spotlight to find VIDEO_TS folders. I don't know, whether Spotlight is available for PC network shares. When adding a folder to the Movie Library manually, it's important to add the right one. If your VIDEO_TS folder has a path like this:

/Volumes/SomeNetworkDrive/Movies/Hello world - the movie/VIDEO_TS

you'd need to add this path to the Movie Library prefs:

/Volumes/SomeNetworkDrive/Movies

If you'd add /Volumes/SomeNetworkDrive/Movies/Hello world - the movie/VIDEO_TS, the "Hello world" movie wouldn't be visible in the Movie Library.

Best regards, 
Felix Schwarz