Actually, yes: special characters in filenames, to the point that copying from a Linux share directly onto ROCK’s internal drive is impossible, no matter what you try. Unless you want to forgo Hangin’ Tough [1988], that is. And that’s just one example, I can barely imagine the nightmare for Beak> fans. Not sure if it’s because ROCK, SMB version there, SMB version NAS-side, what the hell it is, but it’s a pain.
Now of course, there’s a workaround, and, since OSX export is broken, that’s mounting ROCK’s internal storage to a Windows box, and exporting everything from within Roon. That’ll still give folder names like “___” instead of “!!!”, though.