Turns out our problem was caused by the Publish Press Revisions plugin.
Thanks @tobiasbg for your effort to get to the bottom of this!
Hi Tobias,
Some of our authors are experiencing the same problem, but we do not use the jQuery Migrate Helper plugin.
It’s worth noting that we’re on a multisite network, and not every user has this problem (personally, I got the error once but after that everything worked well).
Do you have any idea what might be the cause?
Thanks,
Elco
https://www.fluentu.com/blog/
Indeed, it’s working now. Thanks @levertechadmin !
Hi @levertechadmin, thanks for the fix. Does the fix also apply to the Premium version or isn’t that updated yet? Ours still shows version 3.2.5
Thanks & regards