:shrug: I don't get how fellow Mac users are having issues. I have a late 2012 Macbook Pro retina, running 10.9.1. I rip/convert/tag all my music using XLD (also use it to embed cover art). Zero issues thus far in the year I've owned my RWAK100. The player & microSD cards mount when I connect via USB. Never a glitch.
Now, I just wish I had it in my hands...waiting on getting it back from Vinnie (had him S mod it), and of course it shipped a couple days later than originally thought, and my part of the world had a nasty blizzard today/tonight, likely delaying things (was supposed to be delivered tomorrow--Friday, January 17 here & w/ Martin Luther King day next Monday, no mail, so I probably won't have my RWAK100-S back until next Tuesday. Can you tell I'm gripping a bit? LOL