Salesforce released a new feature in Summer 16, contacts to multiple accounts. This feature allows one contact to have a direct relationship with one account as well as many indirect relationships.
When creating a DDP I can only choose my recipient from contacts that have a direct relationship with an account, not an indirect relationship. We have a work around, we reassign the contact to a different account, but it would sure be great if we didn't have to do that. It would be perfect if Drawloop would support the new contact model and show all contact associated with an account, not just the direct ones.