create virtual machine: wizard halts after first selections

OpenSuse 11.3 (64-bit version) with virtualization tools installed starts to create a virtual machine with the wizard in Yast, but after I select either “install new OS” or “I have disk with OS on it” the Forward button produces no action. The wizard stops. Can go back, to change the selection, but not forward. I chose Other for an OS because the disk in the CD drive is AsteriskNow, 64 bit, version 1.7.1 with freePBX. Previous attempts did produce a virtual machine, which seemed to be running Asterisk and freePBX (who’s web interface was reachable from another machine). These earlier VM’s were deleted.

Can’t figure out why the VM wizard now halts. Hints appreciated.