MJPEG decode fails on Windows app store Camera applications

Hello

I'm developing device driver for webcam that supports MJPEG

It works fine with YUV/RGB but there is a problem using MJPEG 1280x720 only on  Windows app store applications (Metro)

Sometimes the video is stuck or showing black frame (and sometime it works OK)

When using  MJPEG 1280x720 in Desktop applications (both Direcshow and Media foundation apps) - it works fine.

I've discovered that when I disabled the dll mfx_mft_mjpgvd_64.dll  (rename) - it works perfectly also on Metro applications.

How can I understand the root cause of this issue? How can I debug or fix this issue?

Thanks

Haim.