PD9 unable to configure Boot Camp VM

[Mixolydian]

Since upgrading to Parallels v9, I am unable to make ANY changes to the configuration for my Boot Camp VM. I tried deleting the VM, but now I can't even open it.

Failed to configure the Boot Camp partition's hard disk.

A disk configuration error has occurred. Make sure that you have read/write permissions for the disk.

Error: PRL_ERR_UNIMPLEMENTED (0x80000008)
Path: '/Users/<me>/Documents/Parallels/Windows 7.pvm/APPLE HDD ST1000LM024 (disk0).hdd'

I know that NTFS write support is not available in OS X, but I was not having this problem prior to upgrading to Parallels 9.

Running the latest version of OS X and Windows 7 from boot camp partition.