e-Newsletter Plugin - Can't add email content


I've setup the e-Newsletter plugin and started to create my first Newsletter, however when I try to open the Content tab, the sidebar shrinks to 60px and the Email Content box appears disabled. Looking at the Javascript console in Chrome it's complaining about NivoSlider:

"Uncaught ReferenceError: NivoSlider is not defined"

I haven't had time to investigate further, but could this be a bug with the e-Newsletter code (conflict with NivoSlider) or is it likely to be at NivoSlider's end?

This happens in Chrome and IE 9.