User blog:Robin Patterson/Sudden problem with article display

Since returning to my favourite website after breakfast, I've seen no properly displayed "facts" articles. Looked at several and seen what looks like a jumble of templates etc.

Even a "/tree" page is garbled. Here's what I see for Byrd Webb (1802-1889)/tree:

Byrd's article starts like this:

{{#declare: baptism_date-approx=baptism_date-approx {{#declare: remains_date-approx=remains_date-approx {{#arraymaptemplate: |Template:showfacts person/aux1|+|}} and goes on for screens and screens. I've checked the wiki "recent changes" since I was last active here last night. No changes to templates. It must be a Wikia software problem affecting our key templates.