Trying to login to my Apple ID account using itunes, App Store, iCloud. Each application freezes after entering password. This began after installing the new OS X 10.11 - El Capitan. I'm currently using a MacBook Pro 15' (Mid -2010). Never had this problem with OS X Yosemite. Not sure if it has anything to do with the Keychain. Anyone having the similar problems?? Any help will be gladly appreciated..!!!