That's why I said not 100% sure. I am 100% sure it was a command line argument to devenv, just not 100% which one. But yeah, I did spend 4-5 hours on it.
Note that I believe that requires Admin elevation, which may not happen during your install? But I also had your templates after your(and MF) install, they just disappeared later. From what I've read, this latest addition of 'portable library' stuff has created many new issues (hard coded links to v2.05 of System.Core), of which I am guessing this is just 1 more.