[Plugin: WP to Twitter] Custom tweets wont be posted, default string is used

Hi,

we’re using this plugin for a long time and appreciate the work in it. But there is one issue we can’t explain, so we hope to get some help here.

We’re having several authors (WP-Role: Author) and two Admins, including me (WP-Role: Administrator).
All of us are filling out the box for a custom Twitter-message before publishing a post. Some of us are scheduling the post, some of us are publishing right away.

But: Only my custom tweets are really posted. The tweets from other authors (including the second admin) are not recognized and the default string is used for the tweet (“New entry: …”).
We are sure not using too long tweets (we decided to have a deadline at 124 characters, including tags and so on), we tried to publish manually and automatically.
Perhaps it’s important to know that I’ve installed the plugin – a hint why it’s working for me?

Thanks for your help!

http://wordpress.org/extend/plugins/wp-to-twitter/