After applying SP10 on Dual Stack (Java+Abap) in the User Administration (launched from the J2ee admin page - http://FQDN.com:57600) we get the following error;
A check if users can be created failed. The UME configuration might be inconsistent. Check your Security Policy settings (Especial "Maximum Length of Logon ID") and your Persistence Configuration.
I checked Notes db, and sdn could not find anything on SP10.
Regards,
James