TOPIC: CNotes suddenly not working

I only get a blank screen with a message like this:
{"status":"OK","note":{"edit":"\/component\/cnotes\/?task=note.edit&id=38","title":"ny notis","note":"funkar det idag?"}}

Any idea?

Javascript conflict on the page - most probably wrongly included jquery...

The module needs Mootools to function.
Some plugins will disable Mootools, and that will definitely cause some troubles!
I experienced problems when using a plugin called 'Mootable'.