A very strange problem occurs with fed 15 + gnome 3 beta

[Alexander Volovics]

This is probably not the right place to post but I suspect somebody
here can give me a helpful hint.

I have been running the fed15/gnome3 beta on my laptop without
any problems up till now but something very curious has happened.

I cannot boot a live cd on this laptop anymore!
The cd drive lights flash, it makes some noises and then
instead of the BIOS giving priority to the cd drive it seems
as if fed15 just steams ahead and takes control instead
of the distro on the cd and up pops the fed15 bootloader/manager
screen again.
It does not make a difference if I restart or shutdown and
power up again.

The laptop is configured to boot from cd.
The live cd (fed15 + xfce) works perfectly in another pc.
I can mount the cd drive and look at the contents, unmount it
and eject the drive.
The same happens with another live cd (ubuntu 11.04).
Booting a live cd worked perfectly under the previous OS: fed14.

Before I file a bug report I would like to know if I am
overlooking some (configuration) quirk of fed15/gnome3,
something that has changed from fed14.

And if a file a bug, under what system or OS component.

Alexander