I just tried using the widget and the same thing happens.
Hi, just to let you know that the plugin seems to miraculously be working again – not sure what happened but it seems to be resolved!
I have just installed this plugin and am having the same problem – it authenticated fine but no tweets ever go out, and if I click the “Tweet Now” link it says
Twitter did not accept your tweet. In most cases it’s because it’s a duplicate. We suggest moving the post down the queue and re-tweeting it again later.
Some of these links have never been tweeted from my account, others not for over a year, so I’m surprised they are flagging up Twitter’s duplication error.
Please help!