I just completed the latest Windows 8.1 (64) updates on 2 pc's including ( KB2919355). I am using VLC 2.08 (pc1) & VLC 2.13 (pc2) 64bits and both fail to open on either pc after the update. Both worked fine before the update. VLC is my default video player but all videos will not open unless I force a different player such as WMP. On one pc, I attempted to completely remove the player and reinstall new but it still refuses to open. Something stopped working because of update.
Note: I am using version 2.08 on one pc as it is the last version that works with HDHomerun software (http://zaren678.github.io/HdhomerunStreamServer/). See known issues.
Update 1: On one pc using 2.13 (64), I removed and replaced with 2.13 (32bit) and it works fine. So apparently it is related to the 64 bit version only. On other pc, I prefer to keep 64 bit version (2.08) to allow use of HDHomerun which works on 64 bit version only.