The new "Transformers Age of Extinction" 3D blu-ray (ISO) has a Dolby-TrueHD 7.1 track with embedded ATMOS data and will not play on the Q5, the video plays but no sound. Unfortunalely it is the only lossless audio track.
As more discs emerge with Dolby ATMOS embedded this will become a serious issue if it is the only lossless audio track available. The codec is meant to ignore the additional embedded ATMOS data and just play the TrueHD audio.
Other players and cross rippers are having problems also but fixes are appearing.
Please can Hi-Media supply a fix for this in the next FW upgrade.