We have SAML authentication enabled and works fine until your session times out.   When you click on any link within Endpoint Central you get a "Sorry Page" then redirects you do the login screen.  If you click on the SAML login link again it "logs you in" but takes you to a blank page with https://ourendpointcentral.server:8383/configurations in the address bar and does nothing.  You have to refresh the page, and it takes you right back to the login page where clicking on the SAML login link actually works this time and logs you into Endpoint Central and works as normal.  While this does not break anything, its an annoyance and I am curious if this happens to anyone else.