we also saw that when accessing the bpc via the following URL saml authentication fails and the browser has to be refreshed
https://abcd.com.au:2343/sap/epm/bpc/web/index.html
but when we access via the following URL saml sso works
https://abcd.com.au:2343/sap/bc/ui5_ui5/sap/bpcwebclient/index.html