Thread:Extension talk:WYSIWYG/MW 1.24 WYSIWYG/FCKeditor V4 : allowedContent(ACF) cannot be updated for new buttons/plugins

desperately trying to update CKeditor.config.allowedContent everywhere, following CKeditor documentation, to add a custom tag from a new button (linked to Extension:EmbedVideo). Succeeded in creating new button, but the insertHtml function is filtered out, striping my custom tag. Tried everything, hacking filter.js, adding allowedContent in my plugin, in config.js, nothing seems to change anything, as if allowedContent was now deprecated, bypassed. I noticed also that my is set automatically to Anyone may have an idea/explenation/suggestion ?