EXACT same thing with me. Reset password (to one that didn’t look anything like my prior ones), and it worked. Two tweets later – boom. Back to the same problem.
I use TweetDeck on occasion, too, but I haven’t used it recently. I’d been using Twitter on the web and Twitter for iOS (iPad). You’re right – strange things are happening.
I have a support ticket in (Case #: 14784418). The first response I received was this:
We’re sorry to hear that you are experiencing issues connecting to the Twitter API. Twitter places temporary limits on actions that can be taken by both user accounts and applications. This error will often disappear after the application refrains from making the same requests for a few hours.
If you have confirmed that the error is persisting after a few hours, please provide the following information to help us troubleshoot this issue:
IP Address
API Endpoints being accessed by the application
Time that this error began to appear (as specific as possible)
Usernames of accounts affected by this error (if applicable)
Further information about the application’s activity during the time when the error appeared
I have replied with the requested information about an hour ago, but I have not yet received a response.
At this time, I’m unable to tweet at all (though at times it would allow me to tweet as long as there were no @ mentions in the tweet).