I had an Alfresco 3c with share wich was migrated from 2.1. It was working quite good, and we decided to migrate to 3.2r to correct some ajax problems on IE.
But since this migration, Share's groups are no more visible in Alfresco Explorer neither Alfresco Share. Moreover, site's invitation does not make any error, but after the user invited accept the invitation, he can't access the site.
It seems that in the ui, we see the user in the group, but when we try to access theses folders, the permission accepted.