I installed Semantic MediaWiki and ChapTimeline today, but couldn't get the latter to work. My #ask query works okay, i.e. it displays data nicely as long as the "format" parameter is not "chap-timeline". If it is, the generated HTML is
<div class="chap-timeline"><div id="chap-timeline-1" class="container"></div></div>
but nothing is displayed there.
I also installed the InteractiveTimeline extension which works flawlessly.
Thanks for consideration!