Have VLC player v. 2.2.4 (64-bit) on OSX El Capitan v 10.11.6 using Firefox 53.0.2. Recently purchased two sets of Region-free DVDs: One set refuses to download and play, second set plays first 2 discs, the 3rd disc will not download and play. Cannot figure out problem. Should I remove 2.2.4 VLC ver...