I can edit the custom HTML code in CodeMirror
I can see the custom HTML code in a textbox, but can't save any changes.
PHP Built On Linux server.heidoc.net 2.6.32-042stab112.15 #1 SMP Tue Oct 20 17:22:56 MSK 2015 x86_64
Database Version 5.5.5-10.1.21-MariaDB
Database Collation utf8_general_ci
Database Connection Collation utf8mb4_general_ci
PHP Version 7.1.2
Web Server Apache
WebServer to PHP Interface cgi-fcgi
Joomla! Version Joomla! 4.0.0-dev dev [ Amani ] 8-February-2017 14:11 GMT
User Agent Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36
Can't confirm either.
Please try fetching the latest code from the repo, reinstalling Joomla 4 and trying again.
I'm testing on a fresh installation from the nightly build. Is the code in the repo any different?
I'll also test different browsers.
@JanKrohn-Khalibre you can try also applying this patch: #14575
@JanKrohn-Khalibre did you try with the patch mentioned above?
Status | New | ⇒ | Closed |
Closed_Date | 0000-00-00 00:00:00 | ⇒ | 2017-03-18 13:58:23 |
Closed_By | ⇒ | wilsonge |
This is now working again for me in the 4.x branch after doing some fixes today. Please post here if it's still an issue for you :)
Can't confirm:

System information
Joomla! 4.0.0-dev
macOS Sierra, 10.12.3
Firefox 52.0 (64-bit)
MAMP 4.1.1