Probably "it doesn't do what I want, and I can't find out how to change it!".
KDE is busted for me, too, in some respects - it's not network transparent! I have an old system I use as a terminal.
Log in locally on the main system, stick in a CD or usb stick, and up pops the notification window. And it mounts fine.
Log in over xdm, and I get NO notification window. And mounting comes back "only root can mount this device". WHY? That's important to me because I switch between computers and would like my experience to be identical!