I renamed the file "Movie-2hd.mp4" into "Movie-2HD.mp4" and the
debug log showed this:
2014-09-09 14:48:55,878 INFO [LibraryUpdatesCheckerThread] Started looking for updates to currently shared files
2014-09-09 14:48:56,428 INFO [LibraryAdditionsCheckerThread] Added file 'Movie-2HD.mp4' (title: Movie-2HD) to Library
2014-09-09 14:50:12,763 INFO [LibraryAdditionsCheckerThread] Finished looking for newly added files
Afterwards I renamed it back to "Movie-2hd.mp4" forced recheck a few times but always without any result except the following:
2014-09-09 14:50:13,096 INFO [LibraryAdditionsCheckerThread] Started looking for newly added files
2014-09-09 14:50:13,096 INFO [LibraryUpdatesCheckerThread] Started looking for updates to currently shared files
2014-09-09 14:50:36,768 INFO [LibraryAdditionsCheckerThread] Finished looking for newly added files
2014-09-09 14:50:36,938 INFO [LibraryUpdatesCheckerThread] Finished looking for updates to currently shared files
2014-09-09 14:50:37,113 INFO [LibraryAdditionsCheckerThread] Started looking for newly added files
2014-09-09 14:50:37,113 INFO [LibraryUpdatesCheckerThread] Started looking for updates to currently shared files
2014-09-09 14:50:37,633 INFO [LibraryAdditionsCheckerThread] Finished looking for newly added files
2014-09-09 14:50:37,805 INFO [LibraryUpdatesCheckerThread] Finished looking for updates to currently shared files
The second test was to rename it completely from "Movie-2hd.mp4" into "A.mp4"
Suddenly all the phantom files disappeared and I can only see the A.mp4.
The log is full with rows of "Removing item....from Library"
Moved back "A.mp4" into "Movie-2hd.mp4" forced recheck and everything seems fine!
Did the same procedure for two more files and the results were consistent with my first findings.
Best