Blizzard broke it.
Before 5.0 going indoors would cause the black circle, which was why the option to dock indoors was added.
Since 5.0 and the introduction of "microdungeons" a lot of spots which are "indoors" but allow you to mount, like undercity, caverns of time, dalaran, ironforge cause the same problems with the minimap. If it's even .1 transparent it just goes fully black, which is why the option exists now to dock on bugged zones. I don't have all the bugged zones added, since I can only add them as i discover them or people report it.
I would not suggest turning on bugged zones tho until next release, because it's only partially working, I forgot to set alpha to 1 when docking so it docks, but goes black.
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