The plugin is not working on Godaddy servers since 14th Jan - ie when Twitter changed the oauth and SSL protocol. The recent update does work on other client hosts - such as hostgator and dreamhost, but not on Godaddy.
Previously, to get the plugin to work on Godaddy I had to check the curl and follow suggestions from here: http://www.ritey.com/blog/2012/03/wordress-hl-twitter-uncaught-exception-during-twitter-authentication/ and here: http://hybridlogic.co.uk/code/wordpress-plugins/hl-twitter/ . The plugin worked fine up until 14th January.
However, these workarounds don't solve the problem now. The error message when trying to load a user on the plugin add user page is: "The selected user could not be found or an error was encountered while contacting Twitter. Please try again later."
I've tried clearing caches, disabling, deleting and reinstalling plugin etc.
Any help would be much appreciated.