I'm 99% certain this is a system specific issue, but not sure where to start looking... Every time there is an MC update (stable channel) "queued" / downloaded and ready, the MC interface (Theater View) ends up hanging (usually when starting a video) to the point that I have to reboot - end process / end process tree will not take it down. After reboot, the update installs normally and everything is fine.
This started at some point with the 19 version, but I reinstalled Windows 7 (pro, x64) shortly after 20 came out (I had "demoed" too many media apps while figuring out what I wanted / needed, things were too jacked up from leftovers). So I'm assuming it is related to my common / custom Windows install settings / routine.
No antivirus on the system, but UAC is enabled (without screen dimming), running account is an administrator, video mode is set for exclusive full screenin MadVR (slightly tweaked Red October HQ settings). Since the video isn't actually playing yet, that _shouldn't_ be causing it, but I'm guessing it is related to UAC somehow.
Hardware wise, the only things I can think of possibly related are the nVidia GTX 750 (344.48 driver, used for audio on Video playback as well) and Echo Juli@ (1.16 ASIO driver via SPDIF for music playback). I've done my best to keep the set-up as simple and basic as I can.