Undo Disks?

Hi, in Parallels 3.0 the undo disks "Ask me what to do" option does not appear to work. I select it, but when I shut down the VM I am never asked what to do with changes to the VM, instead Parallels just discards them.

 

That's strange. For me it always asks. How do you shut down your VM?

 

I think I've solved the problem. I went into preferences and restored the hidden messages, now the dialog shows up after shutting down.