I am totally unable to post a new tweet from last nightly of Shiretoko on Mac (Macintosh; U; Intel Mac OS X 10.5; en-US; rv:1.9.1b3pre) Gecko/20081220 Shiretoko/3.1b3pre, even using a new profile. It works fine from all other browsers including FF304. I have filed this bug for the issue even if I am not really proud of the summary of the bug report. Since there's nothing on the console or the jsconsole, it does not contain a lot of information...

Update: DUP of 470559. Strange, I did a search on "twitter" to make sure I was not filing a DUP and that one did not appear in the search results...

Update #2: twitter's fault ?