Your setup and use is almost exactly like mine.
ad 2) Why use detached view for music playing? Is it because you want to show "now playing" on the big screen? In your setup you could play music "in the background" from standard view.
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I never use detached view in combination with theatre view. Why would you want to do that?
I use detached view for audio, because I feel that standard view is better for overview and browsing. The Big Screen then displays playing now with some visualisation.
When the view is detached and I want to *switch* to theater view, the detached view is minimized and remains on top of theater view *or* the theater view doesnt show because it is behind the detached view.
ad 3) Yes, I sometimes use theatre view when we wish to browse through our photo's, videos while gathered on the couch. For "just a single movie" viewing I still prefer to launch the movie from the 14" and present it directly on the 46". Theatre view has very little added value in that case.
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Yes, I find that when I am browsing movies, I need to go to standard view so that I can look up the movie in IMDB. But my impression is that JRiver is working on some improved meta data displays in theater view.
In these cases, I sometimes detach The display so that I don't have to jump back and forth..
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I think the optimal solution would be if DisplayView, StandardView, and TheaterView could coexist. This would require proper window focus and control of the destination monitor of each view.