I recently purchased a DX50 from a fellow Head-fier, still under warranty (until September). Everything works fine besides one hiccup. Scanning. If I put 10.0 GB of music on the Micro SD, that it will read, but if I add more after the initial copying, even if the SD card hasn't been in the DAP yet, it won't read what's been copied onto that.
I shall, in due time, check if it isn't a faulty SD card, but have you heard of this bug before? Not only does it not scan it, it also makes it impossible for my computer to see it, even though the free memory indicates that the files are there. I have to format and copy a ton of music onto the SD card every time I want to update the content, and when it exceeds a threshold which I've yet to find, it will only scan some of it, "disappearing" the rest into a hidden state (more hidden than "view hidden files and folders").
Note, I got it with FW 1.2.6 and am now using FW 1.2.8. This occurred in both.
Twas the card