I'm not seeing this issue. Are you trying to save an article in the Joomla Article Manager? Please provide details of your issue.

Please try JCE Pro 2.9.26 - https://www.joomlacontenteditor.net/downloads/editor/pro/latest

After Update to 2.9.26 it's still the same situation:
it's not possible to edit content with JCE - see images

Regards
Heinz

Dear Ryan, we can confirm. JCE 2.9.26 is not saving anything unless im logged in as a super user. I've switched back to 2.9.24 which is totally working.
In our case, we have created a new user group and granted ALL access rights. The user attributed to this group wants to edit an extra field (type = Editor). As mentioned, this was always working and it no longer works since the last automatic update to 2.9.26.

JCE 2.9.26 is not saving anything unless im logged in as a super user. I've switched back to 2.9.24 which is totally working.
In our case, we have created a new user group and granted ALL access rights. The user attributed to this group wants to edit an extra field (type = Editor). As mentioned, this was always working and it no longer works since the last automatic update to 2.9.26.

Does this user use a different editor profile to the Super User?

I can reproduce this issue in Joomla 3.10.10 with JCE 2.9.26:

• in AcyMailing after saving a newsletter, the page refreshes and the content is not saved.
  
• after saving an article, the page refreshes and the article shows the previous content.
  

I tested it on 2 different websites and with Google Chrome and FireFox.

However when I switch to TinyMCE, I can save the article/newsletter.

This appers to occur when the editor does not have any tabs, ie: you have not enabled the Code tab and/or Preview tab for the editor.

Can you confirm this?

Thank you for your fast answer!
TL;DR it seems related to using a Custom JCE Editor Profile

Because of your question, I noticed that the "HTML Source" button which was available in JCE 3.9.24, is missing in 3.9.26.
I did not reconfigure anything, I just updated JCE 3.9.24 > 3.9.26.

I checked somewhat more. When I use JCE's "Default" profile, the editor has a Editor/Code/Preview on the right. And then I am able to save the article text. The not-saving issue occurs when I use my own JCE Profile.

So it seems that from 3.9.24 to 3.9.26 some setting has been changed that you have to re-configure in your own Editor Profile.

Please try JCE Pro 2.9.27 Beta - https://www.joomlacontenteditor.net/downloads/editor/pro/development

So it seems that from 3.9.24 to 3.9.26 some setting has been changed that you have to re-configure in your own Editor Profile.

The Toggle Editor button is now disabled by default, see - https://www.joomlacontenteditor.net/news/jce-pro-2-9-25-released