[brazen1]

At the top of MPC-BE menu bar, is View/Stereo 3D Mode set to Auto?  Did you try the sample I linked for you?  KODI should also play sbs.mkv with no hesitation or problems.  Since you confirm it does, so should just about any other player including MPC.  SBS/TAB mkv are very easy to decode and render compared to frame packed.  I still don't understand why you have to manually choose and select which 3D mode let alone evoke it.  Perhaps this is just a quirk with your PJ.  I would question Manni at doom9.  I'm pretty certain he uses a JVC faux k 3D with MPC player and 3D with no problems.  Probably something very simple using these PJ's.....