Zvol not selectable after rollback from Fangtooth

[ChrisChros]

Hi,
I tried to upgrade to Fangtooth but had problems getting my CentOS VM back in operation, so I decided to roll back to ElectricEel.
Now I have a problem getting my Windows VM back running. Due to the import in Fangtooth the path of the zvol has changed. For my two other VMs, it was not a problem to change the path, the system has even suggested the path to the zvol’s. But for my Windows VM there is no suggestion for the zvol. Under Datasets, the zvol is shown in

VirtualMachine/.ix-virt/custom/default_Windows_VM

but I can’t select it under devices/disk of my Windows VM.

How can I now get my Windows VM back in service? Any suggestions?
Thanks

[ChrisChros]

Hi is there a way to move the zvol from my CentOS-VM from VirtualMachine/.ix-virt/custom/ to another folder where I have access. Maybe then I can select the zvol as the volume for the disk of the VM.

Is it maybe because of the name of the zvol? is the “_” the problem and if so, can I rename the zvol retrospectively?