By just changing over to 1.1 - I am seeing massive issues with get the following error:
[twitter] => stdClass Object
[errors] => Array
 => stdClass Object
[message] => Bad Authentication data
[code] => 215
Nothing has changed in our code (we are still authenticating and we can get access keys and tokens), however we are unable to issue update status requests. Has anything changed with respect to API 1.1 with OAuth Tokens? You still accept oauth_token and oauth_secret?