If the Realtek storage device is your Creative ZEN Vision:M then it somehow has the wrong vendor ID. See /lib/udev/rules.d/90-libmtp.rules -- it should be
Code:
# Creative ZEN Vision:M (DVP-HD0004)
ATTR{idVendor}=="041e", ATTR{idProduct}=="4151", SYMLINK+="libmtp-%k", GROUP="audio", MODE="0660"
You can hack it and use the vendor ID you have, but I don't know why it isn't correct in the first place. If you do decide to modify it, note that you should add a rule in /etc/udev/rules.d and leave the rules in /lib/udev/rules.d alone -- anything in /etc/udev/rules.d should overwrite the defaults in /lib/udev/rules.d.