Hi,
I hope you can help us to fix this problem.

SInce while time (before works) - in the backend we fece the problem about manage extra fields.
When we change Category - so change the Extra fields associated groups - we not able so save anymore:
1) we don't see anymore the extrafields changed category
2) we have required fields that block the save operation
3) we collect some js errors
4) we see CKEDITOR error, but we use JCE?
5) we not sure from happen this error, before works fine, we recognise now only because is happen to modify some contents
6) we use Joomla! 3.6.5 and (K2 ast update: August 4th, 2016 - Version 2.7.1

thank you very much in advance...
stefano


index.php?option=com_k2&view=item&cid=3165:103 Uncaught ReferenceError: CKEDITOR is not defined
at HTMLTextAreaElement.<anonymous> (index.php?option=com_k2&view=item&cid=3165:103)
at Function.each (jquery.min.js:2)
at a.fn.init.each (jquery.min.js:2)
at initExtraFieldsEditor (index.php?option=com_k2&view=item&cid=3165:101)
at Object.success (k2.js?v=2.7.1&sitepath=/:481)
at i (jquery.min.js:2)
at Object.fireWith [as resolveWith] (jquery.min.js:2)
at y (jquery.min.js:4)
at XMLHttpRequest.c (jquery.min.js:4)
(anonymous) @ index.php?option=com_k2&view=item&cid=3165:103
each @ jquery.min.js:2
each @ jquery.min.js:2
initExtraFieldsEditor @ index.php?option=com_k2&view=item&cid=3165:101
success @ k2.js?v=2.7.1&sitepath=/:481
i @ jquery.min.js:2
fireWith @ jquery.min.js:2
y @ jquery.min.js:4
c @ jquery.min.js:4
XMLHttpRequest.send (async)
send @ jquery.min.js:4
ajax @ jquery.min.js:4
(anonymous) @ k2.js?v=2.7.1&sitepath=/:476
d.complete @ jquery.min.js:4
i @ jquery.min.js:2
fireWith @ jquery.min.js:2
i @ jquery.min.js:4
n.fx.tick @ jquery.min.js:4
setInterval (async)
n.fx.start @ jquery.min.js:4
n.fx.timer @ jquery.min.js:4
qb @ jquery.min.js:4
g @ jquery.min.js:4
dequeue @ jquery.min.js:3
(anonymous) @ jquery.min.js:3
each @ jquery.min.js:2
each @ jquery.min.js:2
queue @ jquery.min.js:3
animate @ jquery.min.js:4
n.fn.(anonymous function) @ jquery.min.js:4
(anonymous) @ k2.js?v=2.7.1&sitepath=/:475
dispatch @ jquery.min.js:3
r.handle @ jquery.min.js:3
trigger @ jquery.min.js:3
a.event.trigger @ jquery-migrate.min.js:2
(anonymous) @ jquery.min.js:3
each @ jquery.min.js:2
each @ jquery.min.js:2
trigger @ jquery.min.js:3
n.result_select @ chosen.jquery.min.js:1
n.search_results_mouseup @ chosen.jquery.min.js:1
(anonymous) @ chosen.jquery.min.js:1
dispatch @ jquery.min.js:3
r.handle @ jquery.min.js:3



jquery.min.js:2 Uncaught Error: Syntax error, unrecognized expression: [href=#metadata]
at Function.fa.error (jquery.min.js:2)
at fa.tokenize (jquery.min.js:2)
at fa.compile (jquery.min.js:2)
at fa.select (jquery.min.js:2)
at fa (jquery.min.js:2)
at Function.fa.matches (jquery.min.js:2)
at Function.n.filter (jquery.min.js:2)
at z (jquery.min.js:2)
at a.fn.init.filter (jquery.min.js:2)
at k2.js?v=2.7.1&sitepath=/:87


jquery.min.js:2 Uncaught Error: Syntax error, unrecognized expression: [href=#itemViewOptions]
at Function.fa.error (jquery.min.js:2)
at fa.tokenize (jquery.min.js:2)
at fa.compile (jquery.min.js:2)
at fa.select (jquery.min.js:2)
at fa (jquery.min.js:2)
at Function.fa.matches (jquery.min.js:2)
at Function.n.filter (jquery.min.js:2)
at z (jquery.min.js:2)
at a.fn.init.filter (jquery.min.js:2)
at k2.js?v=2.7.1&sitepath=/:87

after some text the issues seems to be related at
textarea with option Use Editor

at moment we set not use editor, but could be useful to have

thank you
stefano