Some add-ons don't like the himediawrapper (for 7.1 audio and 3d), they need the Kodi internal player. The way around this is to install another instance of Kodi without the himediawrapper.
Kodi from the Kodi website and SPMC from the SPMC website will exist happily together on the Q5 or Q10, so I recommend installing both and leaving one without the himedia wrapper for use with apps that require the Kodi internal player.