Hide Message Pop-Up "login to user source..." during Login

I am in the process of upgrading my Win7 clients from ZCM Agent 10.3.4 to 10.2.2.

The new version produces during every login a pop-up message "login to user source..."

Can I hide that message box? Ok it stays only for 10 to 20 Seconds but it is annoying.

I did not find any information in docu nor in here.

Thanks Klaus