1. Unable to access App Store (blank screen)
2. Unable to Access Skype using Microsoft Account
3. Unable to Access iTunes with error, 'iTunes can't verify the identity of the server ...'
4. Access to multiple website with https return with error, 'Safari can’t verify the identity of the website...'
1. After install Security Update 2015-004
1. Launchpad > Other > Keychain Access
2. Click 'login' under 'Keychains'
3. Look for 'VeriSign Class 3 Public Primary Certification Authority - G5'
4. Right hand click > Export "VeriSign Class 3 Public Primary Certification Authority - G5"
5. Select ' Desktop' next to 'Where:' > Save
6. Right hand click > Delete "VeriSign Class 3 Public Primary Certification Authority - G5"
7. Apple icon > Restart...