Hi,

What browser are you using?

This appears to be a Javascript error. When the editor loads its looking to see if you're editing an existing equation. If so then the equation would appear in the panel above. What's failing is our ability to identify this - so at the moment I think this is bug rather than anything to do with the way you've implemented it.

I assume that if you delete undefined and write a new equation, that its inserted into FCK correctly?

Thanks

Will.