I've used Tech preview 4 through Beta, then i got 2.0.3.1, somehow managed to skip 2.0.2.1 so I don't know if it would have happened in 2.0.2.1 although it never happened in tech preview 4, 5, or the beta
[edit]: as odd as this is going to sound, it works this time with no errors, at least the project i just saved in 4 places.