i still haven't been able to check your solution on my home installation,

but the same error surfaced in our test environment today on our OBIEE 11G installation.

could it be to the reason that the contents of the following folder were deleted and they were recreated automatically upon the start-up of the managed server?

/u01/app/oracle/product/10.3.6/mw/user_projects/domains/bi/servers/bi_server1/data/ldap/ldapfiles