I have problems with the new Twitter API: v1.0 is working without problems, but if I change the URL to v1.1 I get all the time a error "400 Bad request" (seen with Firebug).
Example:
https://api.twitter.com/1/statuses/user_timeline.json?screen_name=twitterapi
This is working like a charm, everything works as excepted.
Simply changing the URL to .../1.1/...
and I get a Bad request error and even to JSON error response or even some content at all.
https://api.twitter.com/1.1/statuses/user_timeline.json?screen_name=twitterapi
Note: It couldn't be a rate limitation, because I accessed the URL the first time ever.