The page break thingy works differently now.
Instead of just [pagebreak] to split pages, you have to give each new page a page title.
You do this by putting:
[pagebreak=Page title here]
In the settings, the page break delimiting field should be pagebreak and not [pagebreak]
Try it and let me know :)
ok i've fixed that. if an article has alot of pages, the side menu gets so long. :)