Seeing this, even after a full rescan. iTunes encoded version of Momoiro Clover Z's "Battle and Romance (Disk 2) comes up as all question marks in album and song titles and all tag info. Disk 1 is fine. All perfectly readable in other systems from same SD card media. Looks like something to do with long track titles and Unicode. I can provide / share the offending album if necessary.
Running the latest dev version on my in-car head unit, which has a hardware "Menu" button. This invokes the right-hand or "dotted" menu when pressed. It would be rather more useful if it invoked the main menu for music selection etc, as it used to in previous versions.