JCE Content Editor 2.8.17 Released
JCE v2.8.17 is a bug fix release which quickly follows v2.8.16 to set the default state of the Protect Shortcode (introduced with v2.8.16) feature to OFF.
For more information we recommend reference to the developer's Release Notes.
See link below.
Are you using an old version of Joomla! CMS?
If your website is not using Joomla! 3.6 or later then JCE 2.8 will not work with it.
You should upgrade your Joomla! CMS.
Just ask if you need help moving from an earlier version of Joomla! to the latest version.
Useful JCE Content Editor Information
Back up before updating any 3rd party Joomla! extension
Any update can break your website.
Perform a FULL backup of your website (database and files) before installing any update.