Playback Issues with M2TS, MPG, MPEG, and TS video files containing Dolby, DTS, and PCM

I don’t know MTS from WMV. BUT I do know that several HUNDRED dollars worth of CinemaNow purchases WON"t Play on my player.  What’s with that!!  BTW If it weren’t for WD HUB I would not have purchased ANY movies from CinemaNow, OR Blockbuster.  Can’t everybody get on the right page? PLEASE!  Great product but I’m starting to be afraid to update the firmware.