That's Finder, isn't it? I don't know what grayed out means on a Mac. Sorry. Read only?
Did you import the files into MC?
What happens if you look under Audio in MC?
That is the dialog you get when you want to import something inside MC and you then click on "Browse" to select the folder to import. Nothing fancy?
I tried to import, but it didn't work at first. By "greyed out" I meant that I cannot select the individual files. OK, I wasn't aware that I can only select a whole folder here and not a file. If I select a whole folder, I can import it and subsequently play the imported MP3s.
Some questions remain though:
1) Maybe my expectations are wrong? From my usage of MC on Windows, I expected that I can just drag a single MP3 onto the app window or open a single MP3 with MC and it just plays. Is that not possible on Mac?
2) I have no menu whatsoever, so I'm not sure how to do anything in the program. There is just "Media Center 18" on the top, where an application menu would normally be, with no menu entries. Is that the expected state at the moment or is this a bug?