After upgrading our stat db from 5.5.5 to 5.6.0, this is the error we are getting when trying to logon to the stat windows client:
Procedure STAT. STAT_STORE has not return a value logon
This is the code that ran in Stat 5.5.x and maybe this grant did not get pulled over in the restore. Have your DBA run this statement:
GRANT EXECUTE ON STAT. STAT_STORE TO STATLOGIN AS STATGRP1
If the above statement does not work, then restore the stat db and make sure that you can logon to the stat windows client before proceeding with the upgrade again.