After the update to Yosemite and iTunes 12.0.1, all my movies and TV shows just show a black screen and don't play at all. So has this update finally broken my 30" display due to the DRM? I have a multiple display setup on a Mac Pro, with the only approved Apple DRM display being the 30" ACD. A previous iTunes update a while ago broke the other two monitors in regards iTunes content but the 30" continued to work and play iTunes content as an approved DRM device right up until yesterday. A google search has only come up with one other instance during the beta testing phase of non-playing video by someone on a newer iMac which was fixed by a update, so I'm hopeful it's just a bug and it'll be fixed. But I just tested the iTunes m4v files with Quicktime and I'm getting the DRM 'can't play' message on the 30" screen now too just like on the other two displays.