Problem 4 vbulletin integration - automatic login

Hello I have a forum vbulletin 4.1.7. I installed v4.1.5.1 and aMember I enabled the plugin for vbulletin. The interaction works well except for access to the forum because after you get into aMember by logging in to access the forum must re-enter the data access aMember and this is not done automatically. Why? Because once I did I have access to re-enter the data again aMember login also on vbulletin forum attached? I ran all configurations correctly. I've done something wrong?

Thanks