Tweetium for Windows Phone has received a new update for windows phone Devices.  The latest update fixes the Twitter image upload issues and also brings small performance tweaks

Tweetium Changelog:

– Temporarily revert to the legacy photo upload API for single photo posts
— This is to work around Twitter’s currently broken media upload API.
— Note that multi-photo posts will still fail until Twitter fixes their bug.
– Improved error handling for photo upload errors (such as Twitter’s current “over capacity” errors)
– Several small performance tweaks

Install Link