After I upgraded my Virtualbox server to 3.2.8 I was unable to access certain disk images. I got the error

The medium type <path to image file>.vmdk is differencing but it is not associated with any parent medium in the media registry

I was able to fix all images with a tool called VBoxFixHdd which is described in this forum entry.

The medium type
> C:\...\ftp_server.vmdk is differencing but it is not associated with any
> parent medium in the media registry
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