Hi,
I've recently purchased a Retina Mac, specifically an iMac with a 5k display. If Retina mode is OFF, things look a little weird: Icons are too big relative to the columns and things. I guess it's the reason you guys have a Retina mode to begin with. But, with Retina mode off, the OSD in Theater View is normal. You can see all of the text that it brings up. Unfortunately, Retina OFF also makes Theater View do weird stuff and makes it unusable.
So Retina Mode must be ON to give a good view in Standard View *and* to be able to use Theater View. Unfortunately, Retina Mode has the side effect of making the fonts in the OSD *Enormous*. Some much so that you can only see about 4 characters of any given part of the OSD. "Playing Now", just shows up as "Playin". To be clear, I'm talking about the OSD overlay that comes up when you press the UP arrow.
Thanks for reading.
Brian.