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I'm disappointed at the lack of help you're receiving but I think many of us are focused on the Grid Control and Cloud Control environments -- I know that I remember very little about DBControl monitoring. You may get better help here if you can migrate to EM12cR2.
My only suggestion for you is to re-confirm that the password files on each instance are all set up correctly. Take a look at notes 790214.1 and 778805.1, compare the contents of $ORACLE_HOME/dbs/orapw[SID] on each host to make sure they match. Make sure you can login directly to each instance using the passwords you believe are configured for DBSNMP, SYSMAN, and SYS as SYSDBA; use EZconnect strings to reach each instance directly or add new tnsnames.ora entries if needed.
What is the monitoring user - dbsnmp or a sysdba user? Go to Monitoring Configuration page and click on Test Connection. Is that successful? Also, try Test Connection against each RAC instance in the instances table at the bottom of the page. Let me know the results of this first and then we can look at next steps.