[TYPO3-english] jetts mapping wizard and CSRF token failed

[Mark Roemermann]

Hi list, is the jetts extension compatible with 4.5.4 LTS?

I installed it from TER and am going through the tutorial, however when
I map a template with the wizard and go to save the resulting
typoscript, it gives me the error:

"Validating the security token of this form has failed. Please reload
the form and submit it again."

Where do I submit these sorts of errors, core? or the ext author?