I couldn't find any references to it anywhere. So I must have been the lucky one LOL. And it didn't do it to files I created in 2.78A and then resaved in in 2.78B only new projects I created in B. And was the first I checked with the 2.78C patch which doesn't do it either. But also had other issues with B after doing a couple of low sample renders to get things right, ramp up the sample settings click render and the program shut down, didn't crash at all just closed down, reopen it and load the project and then render no probs with the higher settings. Doesn't happen in C. And taught me about saving before rendering (the hard way) lol