Authorization failed



I made an app that sends twitter messages from Max/MSP in May of 2011. The app has worked fine up until about a week ago. Now when I attempt to tweet from Max using the app I receive I receive an error “Authorization failed”. I have double and triple checked the Consumer Key, Consumer Secret, Access Token and Access Token Secret and they all match. These have not changed since I started using the app. Has anyone else experienced a similar issue?

thank you,