Hey all! So, I've been experiencing an issue on my Retina MacBook Pro running the latest Yosemite public beta. I've experienced at least 5 system crashes since running Yosemite which freezes the entire system and I have to hold down the power button to recover from them. I've reported this in the Feedback Assistant twice but I wanted to assess whether others had experienced this? I can't see that it's got anything to do with my machine seeing as I never experienced this in Mavericks. I'll also note that it mostly seems to happen when I'm doing something in Safari.