I installed this plugin on both 3.0.1 and on 2.9.2 and I receive errors when I tried to log into admin. Tried to fix the errors by deleting extra lines and spaces in the superfish-widget.php file but didn't help.
Error 1:The plugin generated 3 characters of unexpected output during activation.
Error 2. Cannot modify header information - headers already sent by ...
Would be great if there was a fix for this.