Feed no longer working?

Mario,

First let me say thank you for the great service!

One of my feeds just stopped working. Worked great up until just recently, no idea why it's no longer working. I deleted the old feed and setup a new one but still no luck. The feed parses just fine (even your system say's it parses ok). But no updates make it to Twitter.

Feed:
http://www.early-detection-for-breast...

Twitter Username:
earlydetection

Thanks for looking into this!