I use a mac and just reinstalled Yosemite OS. My TV / Movies & media worked perfectly before I reinstalled my OS. To try to fix it I have done numerous things recommended: 1.) Made sure flash is the one for firefox 2.) Made sure that Quicktime is installed 3.) Reinstalled Firestorm for and CtrlAltStudio Viewer. (neither worked for media/videos) 4.) Tried SL Viewer, Singularity and Catznip 5.) Contacted Media vendor 6.) went to many media stores that sell TV's and tried to demo TV movies / videos at them without success So basically I am unsure what to do. Any help would be appreciated.