Ever since the 3rd public beta, after a restart, instead of my Mac booting up, it triggers the blinking folder with the ?. I have to then restart it and hold the option key to choose the hard drive. This happens after every restart or shut down. Anybody else have this problem or any idea how to fix it? I submitted a report to Apple through Feedback Assistant, but it wasn't fixed in the public beta 4 released yesterday. Just didn't know if its a bug or something that went wrong with my Mac that I need to fix.