I’ve been using the Twitter Tools plugin by Alex King and have really enjoyed the features and functionality. Unfortunately, for quite a while, it hadn’t been working. I thought it was due to me upgrading to Worpdress 2.5 but I was able to get it working again simply by re-entering my login information for Twitter.
Maybe I reset my Twitter password? I forget.
No, when you overwrite during the upgrade it overwrites the file that contains the login information ;).