The CDF came out with a statement that clearly said what the charismatics were doing was illicit. Basically, exorcisms without priests. Some priests have read the document and said private prayers, not in the name of the Church (since we have no apostolic authority), but in the name of Christ were OK. Others interpret it differently and say binding prayers are never allowed.
Always do what your priest says, but for the purposes of discussion I think the problem is really that people think they have some authority over the demon. We as laity do not since we have no apostolic authority. Any binding of the demon is done by God in answer to our prayers; as opposed to binding in the name of the Church to whom God gave this kind of authority. When this got blurred, the CDF had to come down and restrict the use of binding prayers including exorcisms that were allowed to be used by the laity before.
Maybe I'm leaning too much on the less strict reading which allows private use, but I think the point of the CDF is don't be a dumby and get in over your head.