Hi everyone. Hoping for some help from people who know a lot more about this stuff than I do! Yesterday Safari, the App Store, and iTunes all stopped working on my 2011 iMac. None of them will connect to the internet and I've tried everything I can think of. I'm still running Mountain Lion on it. I can get online fine with Firefox and Chrome, and I can stream via things like Spotify with no problems. But those Apple apps just won't work. I've tried logging in as a guest and still nothing. Any ideas what's going on or what I can try? I'm not sure if this is because I haven't upgraded to Mavericks, but I can't upgrade now because the app store won't connect!