Hi there,
you can choose from several different Layout Templates. Not all of them include the %TRACKDIAGRAM% placeholder.
So, first Q: what Layout Template do you use?
2nd: have you modified it? The templates are very "sensitive" to correct spelling...
If you can send a link to a test site that is online (by private mail), i can take a look.
Screenshots of your plugin settings would also be helpful to find out what's wrong.
cheers, Frank