Thread:Extension talk:EasyTimeline/Trouble getting tag:timeline timeline syntax to work

I am having trouble to install this extension, well sort of. Using works like charm. If I use  the text is not showing up. This advice seems unrelated and does not help anyway.

The wiki is on MW 1.22.5 and PHP 5.3.3 with the latest pre json-i18n code.

I will very much appreciate any hint on how to resolve this.