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We have fixed the problem. It should work after refreshing your window.
Okay, that's easy: just uninstall or deactivate your RiteTag browser extension.  In Chrome, Tools > Extensions > Ritetag.
Jeseph, please send screenshot of "console" at the time that you send a tweet and cannot close? Thanks, we'll nail this.

can you try again? I checked your account and the expiration is set to 2014-10-09 01:57:53.