Downloaded the update when it came out - big mistake, I never do that - I usually wait till bugs are worked out. That said, I had to go back to Maverick, nothing was working and I have a brand new macbook pro. Even now after the move backwards, the App Store doesn't work properly, I have intermittent slowness and drag, wish I had never make the change - hoping all will be fixed with Yosemite soon......
Also, had to leave Safari and install Chrome - I keep having issues that Safari can't get a secure connection on a site, so I couldn't access this site, my banking site and many others - very frustrating. I want my reliable, never have an issue macbook back.....grrrrr