While trying to add the reply
https://www.mediawiki.org/w/index.php?title=Topic:S5h06833qt1gype6&topic_showPostId=sew2ojrqtkcppu82#flow-post-sew2ojrqtkcppu82
I got the following using Firefox on Ubuntu Studio 14.10:
TypeError: templateModel is undefined
in the console. The field was using some sort of VisualEditor at the moment and I switched back to wikitext.