I wonder about it being an Apple problem. Previously I had Fusion 5 Pro, downloaded the evaluation for Fusion 7, which runs as pro, and it worked great on my mbp. When it came time to purchase a license key, I opted for a non-pro key, since I didn't need any of the feature of 7 Pro.
Once I entered the 7 (non - pro) license key, it tanked Fusion on my machine, it's been beach balls ever since. My Windows Experience Index in the virtual machine went from a 6.2 to a 4.1 - the low scores are now in the 3D and Aero indexes, but it doesn't seem to matter how I configure my VM now, it just doesn't work well anymore.