Can't get Yast to use the cdrom as source of installation ?

I think something has happened to my SuSE 9.0 installation as I can no longer get yast to use the cdrom as source of installation. In "hardware / CD-ROM drives" I have added the cdrom, but when adding the drive, in software/Change source of installation it adds it with name cd:/// and url: cd:///. When running "install and remove software" I can only see already installed software, not all the software. If I mount the cdrom manually and adds the /dev/cdrom in "Software Source Media", I can see and install all software on the media. But how do I get it to work properly ? I have moved my harddisk with 9.0 to another machine, and the problem is the same, so it's not the hardware that fails. Any suggestions Bo