This plugin used to work just fine, but not anymore. Now the plugin's settings page stays blank and Tweeting a post from the Edit Post page times out.
A couple of weeks ago I upgraded WP to 3.3.1 and PHP to 5.3.3 (mod_fcgid), probably there is some incompatibility with one of these newer versions.
Some errors from the error log:
mod_fcgid: stderr: PHP Fatal error: Uncaught exception 'EpiTwitterException' in /wp-content/plugins/hl-twitter/api/EpiTwitter.php:271
mod_fcgid: stderr: PHP Fatal error: Cannot use object of type WP_Error as array in /wp-content/plugins/hl-twitter/functions.php on line 236
mod_fcgid: stderr: thrown in /wp-content/plugins/hl-twitter/api/EpiTwitter.php on line 271, referer: /wp-admin/admin.php?page=hl_twitter_users