Installing magicline plugin

I have downloaded the magicline zip file and expanded it locally. Then uploaded to ckeditor/plugins/. Then modified ckconfig.js, adding magicline to

config.extraPlugins             = 'wbdroplets,wblink,magicline';

If I then open a page to edit I cannot enter anything into the textbox. I remove the magicline from the config file and it is OK again.

What am I doing wrong. How do I get it to work?