[support] Access denied to Multiforms for all users

Hi, I installed Multiforms module <http://drupal.org/project/multiforms> and everything works within Admin user, I gave other users (authenticated as well as anonymous) permission to access it but I get a "You are not authorized to access this page" message. I tried to give them access to "access multiform administration" (just to try) but anything change.. I deleted cache_* content too but no way.. any idea about where's the problem? :/