We have today noticed that twitter is moving to a new design and also a new URL for your homepage – this is now at http://twitter.com/timeline/home – like many other services we rely upon the fact that we can send a tweet into your box for you to retweet. For those who have the new redesign this currently does not work, due to the fact that twitter is redirecting but not carrying across the variable that contains the text.
We have raise this as an issue and are awaiting feedback on how to solve this and will update you all when a solution is found.
UPDATE: Very quick response back from twitter – this is a temporary problem, the new homepage will NOT be at /timeline/home – and the issue of the redirect will be resolved soon.

Thanks for the write up and clarifying the problem..
I also notice that the “retweet” button is mangled and not operational. Are these problems related?