[cesarleeds]

Well, "3D not working" ... let's a little more specific on this issue. ;-)
Current version is #1216 on RPi3, I use only .MKV and .ISO files for testing (the samples provided at http://kodi.wiki/view/Samples).
My results so far:
ISO-full3D-sample.iso (plays 3D)

HSDB-3D.mkv (plays 3D)
HTAB-3D.mkv (plays 2D)
3D-full-MVC.mkv (plays 2D)

Renaming the non-working MKV files according the video naming rules (http://kodi.wiki/view/3D) didn't change anything.

So what's the difference of these three .MKV files above:
The working MKV file's video stream has set the flag "Video stereo mode" to "1", meaning side by side/left eye first,
but for the other two files there was nothing.
So I changed both file's video stream flags (using mkvtoolnix/header editor on Windows):
HTAB-3D.mkv - "Video stereo mode" to "3" (top bottom/left eye first)
3D-full-MVC.mkv - "Video stereo mode" to "13" (both eyes laced in one block/left eye first)
... and that fixed it.
So on my end 3D MVC .iso playback is working as usual but all 3D .mkv's need to be tagged properly.

But...mkvs had been always tagged properply since they used to work.

I just played that very same 3d-full-mvc.mkv demo file on Krypton, no need to change anything on the mkv file.

Also i played *.3d.mvc.m2ts while this did not work on Kodi´s current version.