Re: How enabling the "Source button"
Hiya,
The "source" button is only available on wiki pages. If the users group has the tiki_p_wiki_view_history permission, and feature_history is enabled (Admin->Wiki) then the button will appear.
if you are using an older style from a upgraded tiki site, then you will need to upgrade your TPL (tiki-page_bar.tpl).
Cheers