I am running the beta version of Yosemite released to the public. I have one serious problem! Mail quits immediately when I attempt to open it. I have sent Apple several instances using the Feedback Assistant. It's now almost two weeks since I installed the Yosemite beta and no solution is forth coming. I tried to run my Mac from my backup disk which is still running Maverick but that didn't work. My wife is ready to kill me! Help please!