Description
Tweeter API was updated recently with new logic and that's why Tweeter feed was not loading.
 
Solution
http://www.viart.com/downloads/block_twitter_feed-4.1.html.zip
 
Extract 'block_twitter_feed.html' in 'templates/user' folder of your shop replacing existing file. Please do not forget to make a backup copy of the current file in case something goes wrong.