update-static-leases not working

Dear all,

Since we moved from ddns-update-style interim; to ddns-update-style standard; it Looks like update-static-leases true is not working.

The Client used WLan in the meantime and his A record got changed to his "mobile-IP". After connecting back to LAN, the A Record didn't get changed.

I also use the option update-optimization false;

Is there a new option for update-style standard?

Please help

Kind Regads
Thomas