Hi guys, I'm having the exact same problem as Jonathan, but I've tried formatting and saving the files again onto the SD card. I've tried both AMF and STL files. I've tried inserting the SD card both with write protect on and off; but it still regards my SD card as being empty. Just an option to go back to the main menu.
This is quite poor. As well; my ulticontroller screen keeps on glitching randomly, and you cannot read what's written there unless you unplug the USB cable and plug it back in. I have check the connection to the circuit board and it's solid. It glitches even without being touched.
Any help you guys can give would be much appreciated.