I just got the new iMac 3 days ago. Everything works great, the trackpad works great too EXCEPT for messages. I can't click on any threads to reply to. I can see the messages come in, and I can see the application, but I can't physically click on anything in the application. I can go on the dock and quit messages for it to go away, but I can't even click to minimize it. So far, the trackpad has worked for everything else. Any idea on how to fix this?