I used the mobile app during the UAT. It works just fine. However, today, i put communities.ca.com in as the URL and hit continue. I saw briefly a message saying 'Processing SAML Authentication...' then I saw the CA logon page just as if I were logging in on my desktop. About 2 seconds later, the page disappears and all I see is a blank white screen with a Cancel button at the top and the word 'Authenticate' at the top.