Same issue here. Adding the flag as outlined stops my virtual machine from loading. After my Virtual Machine failed to load, I couldn't quit Parallels and had to force quit, then I was able to edit the configuration and remove the boot flag recommended fix, so I am back to square one. I would advise against that recommendation mentioned here.
I have my Windows 7 Enterprise (64-bit) installed on a USB3 external hard drive. When can we expect a fix? Currently considering rolling back to version 8 as need to do work on this system tomorrow.
Mac mini (2013) 2.5 GHz Core i5 16GB RAM on Mac OS 10.8.4
Last edited: Aug 29, 2013