VLC never generated previews in the Finder, so this is not a related issue, sorry.
Well something was generating previews in the Finder.
Dracula Untold, Earth To Echo and OUIJA were recorded with VLC 2.1.5. Man Of Steel was recorded with VLC 2.2.0.
The first error I have encountered is that upon loading Man Of Steel, the playlist time shows 17:39:15 however the movie time shows (and is) 2:22:57 ...
... then upon playing the movie, there is no video for the first 26 seconds, only audio (please note the movie time code is now 2:22:31) ...
... then the audio drops out, the time code stops and the video begins (please note that the timecode is 2:22:30) ...
... the video plays for what I assume is 26 seconds with no audio (please note that the timecode is still 2:22:30) ...
... then, like magic, the audio comes back in and all is well. The video and audio is synced.
The Finder also has trouble resolving details of the file ... i.e. Dracula Untold's Dimensions are 720 x 480 and its Duration is 01:32:13 ...
... However, Man Of Steel's Dimensions and Duration are blank.
I would like to note that VLC 2.2.0 does fix the bug that caused recording of long movies (approx. 2 hours) to drop the audio at the DVD layer switch.
MacBook Pro - Intel Core i7 Quad 2.2 GHz - Intel HD Graphics 3000 384 MB - 4 GB DDR3 1333 MHz RAM - OS X 10.9.5