VM Manager - Cloning disks, why shared or "full clone" options change repeatedly?

openSUSE 12.3, fully updated
KVM-Qemu
Virtual Machine Manager 0.9,4

Attempting to clone “normal” disk.raw image files
Have tried both in default storage pool and a custom storage pool in my User home directory.

Have been frustrated about this for awhile now…

Attempting to Clone a VM using either VM Manager or System > Virtualization > Create VMs for Xen and KVM

From one day to another I might be given the option to Share the disk or Create a Full clone, but never both options at the same time and never consistently one or the other on a discernible basis.

Question

  • Is there a documented how/why VM Manager (and also the other method I described obove) chooses to offer shared or full clone options?

Current alternative which always works is to use the command line virt-clone.

TIA,
TSU