Recently active topics in I want Sandy tagged with direct message

Sandy does not seem to be receiving/responding to my twitter commands. It's been working fine for months, until the last day or so. I can successfully send a tweet from Sandy using the "Test" button on the twitter setup page, but messages from twitter to sandy do not seem to work.

I've tried to get Twitter and Sandy to play nice together, but it's just not happening. I went through the guide to making this happen, almost no success.

I can get Sandy to follow me and me to follow her. I got the confirmation Tweet very quickly. I get the test Tweets almost instantly. But that is where things end.

I've tried copy and paste-ing the examples. All I'm seeing is that my message was sent when I use Pidgin from my GTalk account. But when I send the same message from the Twitter website I am told that the user doesn't exist.

Um, what? I don't think I can follow someone who doesn't exist.

There are no replies and no direct messages from Sandy on the Twitter site.

I really don't know what else to tell you so that I can have this working right, but I'll be happy to answer any questions that could help lead to the solution.