Trying to tweet from a script


I’m using a link & video directory script which has a module for posting tweets through my Twitter account every time I create a new listing in my directory. It’s correctly set up for read/write. I grab my consumer key and secret and access token and secret from the OAuth tool and I have access to the CURL library. But my software isn’t tweeting. I tried setting my website to both the main url,, and the actual directory where the script resides, I set the callback URL the same and I tried leaving it blank too. No tweets are showing up. My request type is Get. I tried setting it to Post, without success. Any suggestions?