Fixed – see here:

OMG. I found it. There was no mailchimp in use, no signup or subscribe so I was confused. (and this was a site I just took over so had no history)
Turns out there was some broken mailchimp code in a widget that wasn’t visible…
OMG! That was much harder than it needed to be. Thanks

thx, the configuration changed during the update. I switched it back now.

• This reply was modified 4 years, 9 months ago by CommunityHousing.

I also just realised – when I deactivate ALL plugins and go to the page, I get lots of jQuery errors:

embed.js:6 Failed to load resource: the server responded with a status of 404 (Not Found)
q.getText @ embed.js:6
embed.js:20 Uncaught Error: xhrFailed
    at p (embed.js:2)
    at Function.q.getText (embed.js:6)
    at ra (embed.js:23)
    at b (embed.js:2)
    at embed.js:11
    at ka (embed.js:20)
    at oa (embed.js:11)
    at Ka (embed.js:24)
    at Ja (embed.js:27)
    at isotope.js?ver=5.3.2:11
avia-snippet-lightbox.js?ver=4.7.2:172 Uncaught TypeError: links.not(...).addClass(...).magnificPopup is not a function
    at HTMLDivElement.<anonymous> (avia-snippet-lightbox.js?ver=4.7.2:172)
    at Function.each (jquery.js?ver=1.12.4-wp:2)
    at n.fn.init.each (jquery.js?ver=1.12.4-wp:2)
    at HTMLBodyElement.<anonymous> (avia-snippet-lightbox.js?ver=4.7.2:168)
    at Function.each (jquery.js?ver=1.12.4-wp:2)
    at n.fn.init.each (jquery.js?ver=1.12.4-wp:2)
    at n.fn.init.$.fn.avia_activate_lightbox (avia-snippet-lightbox.js?ver=4.7.2:161)
    at Object.$.avia_utilities.avia_ajax_call (avia.js?ver=4.7.2:61)
    at HTMLDocument.<anonymous> (avia.js?ver=4.7.2:44)
    at i (jquery.js?ver=1.12.4-wp:2)

Some of these errors are from mailchimp??? I deactivated all plugins???
Also, this is the theme on its own – no CDN, no plugins…

Thank you, I think we’re going to bite the bullet and upgrade.
Can I straight upgrade from 4.0.7 to 4.7.2 or is there a recommended safe upgrade path?

Done:

jquery-migrate.js?x66868:47 
console.trace
migrateWarn @ jquery-migrate.js?x66868:47
get @ jquery-migrate.js?x66868:62
AviaBrowserDetection @ avia.js?x66868:74
(anonymous) @ avia.js?x66868:3
i @ jquery.js?x66868:1
fireWith @ jquery.js?x66868:1
ready @ jquery.js?x66868:1
J @ jquery.js?x66868:1

jquery.js?x66868:1 
Uncaught Error: Syntax error, unrecognized expression: unsupported pseudo: regex
    at Function.ea.error (jquery.js?x66868:1)
    at PSEUDO (jquery.js?x66868:1)
    at va (jquery.js?x66868:1)
    at ea.compile (jquery.js?x66868:1)
    at ea.select (jquery.js?x66868:1)
    at Function.ea (jquery.js?x66868:1)
    at Function.jQuery.find (jquery-migrate.js?x66868:290)
    at jQuery.fn.init.find (jquery.js?x66868:1)
    at jQuery.fn.init.jQuery.fn.find (jquery-migrate.js?x66868:677)
    at jQuery.fn.init.n.fn.init (jquery.js?x66868:1)
ea.error @ jquery.js?x66868:1
PSEUDO @ jquery.js?x66868:1
va @ jquery.js?x66868:1
ea.compile @ jquery.js?x66868:1
ea.select @ jquery.js?x66868:1
ea @ jquery.js?x66868:1
jQuery.find @ jquery-migrate.js?x66868:290
find @ jquery.js?x66868:1
jQuery.fn.find @ jquery-migrate.js?x66868:677
n.fn.init @ jquery.js?x66868:1
jQuery.fn.init @ jquery-migrate.js?x66868:241
n @ jquery.js?x66868:1
(anonymous) @ avia.js?x66868:194
each @ jquery.js?x66868:1
each @ jquery.js?x66868:1
$.fn.avia_activate_lightbox @ avia.js?x66868:193
$.avia_utilities.avia_ajax_call @ avia.js?x66868:10
(anonymous) @ avia.js?x66868:9
i @ jquery.js?x66868:1
fireWith @ jquery.js?x66868:1
ready @ jquery.js?x66868:1
J @ jquery.js?x66868:1 

shortcodes.js?x66868:11
Uncaught TypeError: $.AviaTooltip is not a constructor
    at HTMLDocument.<anonymous> (shortcodes.js?x66868:11)
    at i (../jquery.js:1)
    at Object.fireWith [as resolveWith] (../jquery.js:1)
    at Function.ready (../jquery.js:1)
    at HTMLDocument.J (../jquery.js:1)