TOPIC: Duplicate registrations / Authorized twice.

Since the last update 2.6.6c I have been receiving alot (2-3 per day out of 25 registrations) of duplicate registrations and the customers being charger twice through Authorize.net. I have tried turning duplicate entries on and off as well as the override within the event, Nothing seems to make a difference. I first thought
that customers were clicking twice and it could still be but it just seems like too many duplicates for that to be the case. Any ideas?