I use DA with the ACM search and I'm getting the error I copied below when attempting to sign in and retrieve the full text of a result:
403 Error - Access Forbidden
We are sorry …
… but we have temporarily restricted your access to the Digital Library. Your activity appears to be coming from some type of automated process. To ensure the availability of the Digital Library we can not allow these types of requests to continue. The restriction will be removed automatically once this activity stops.
We apologize for this inconvenience.
Please contact us with any questions or concerns regarding this matter: email@example.com
Thought you might like to know so that you can contact ACM and cooperate on a resolution for those of us who find both products indespensible.