I noticed, that other Twitter-plugins stopped working when enabling Tweetblender. Plugin like "YOURLS" and "Tweet Tweet" stop working and won't authenticate with Twitter anymore.
See older comment here:
http://code.google.com/p/yourls/issues/detail?id=462 (comment 11)
After disabling Tweetblender, the other plugins worked again.
Any chance, that this incompatibility will be fixed?