[john8546]

Just checked and working for me. Note, In Movie Preferences -> General tab, need to have selected Include Missing video Files when rebuilding cache
In MC, I picked a movie at random. r-click -> Open Folder. Changed the movie filename extension from .mkv to .orig.
in MC, Refresh All.
General Filter, scrolled to Missing Video file (1). clicked it and up popped the previously selected movie. 

Thanks Rob, I did not know, there is a trigger hidden inside the settings treasure box. Now it worked for me.
Can you please let me know what is the functionality of the sort title placed above the poster tab means. 

Thanks John.