[ovirt-users] Problem adding disk to VM

Hello everybody, I have oVirt Engine Version: 3.5.0.1-1.el6 in my installation and when I create a new VM and try to add a virtual disk, the engine does not add the virtual disk when I press OK button. Any message is generated in engine.log file. Is it a bug or any can give me some light about this issue? Many thanks in advanced, Juanjo.