I can't get safari to load the apple express lane web page post mountain lion upgrade ? Other pages now also will not load

Post the lion upgrade safari will now not load some pages....apple express lane start page for one....other secure sites such as web payments sites too. Also I can not get AirPlay mirroring on safari.....which works fine on the ipad.

I have tried downloading and installing the update twice....no change.

Any ideas !

Thanks

Ep