somehow you have done a hard resrt on the player, this can happen by pressing a combination of buttons or freak accident (never to me before)
you need the "resource" ile that has all the images for the user interace as the player has lost them
did you try to update the firmware
go here
http://en.meizu.com/down_x.asp?MZ_ID=137&Type=2and follow the instruction to install the new firmware and al should be ok
a hard reset will format the player so all files wil be lost, but if this happend on its own you need to monitor this and see if it happens again as these players are quite robust and shoul not do this