This looks like a compress_js issue. You can disable this setting temporary quite easy without direct database access.
Edit the file
/core/cache/system_settings/config_cache.php
and search for
'compress_js' => '1',
and change it to
'compress_js' => '0',
and save the file.
After you can enter the backend again. It is very important that you change the real MODX system setting compress_js too, since the cache is deleted quite often. So go directly to your system settings, search for “compress” and disable compress_js.
Thanks for your advice but compress_js is already set to 0 or no both in cache and system settings.
The issue does not seem to be related.
Any thing else to try ?
When you open the “Network” tab of the developer tools of your browser and then save the resource, is there an error message in the response of the request?
Have you tried visiting with your browser in incognito or private mode to make sure it’s not a browser cache issue. Sometimes a leftover cookie will cause trouble after an upgrade.
I finally found out what was causing all these issue thanks to your help.
Actually, it was a too small max_input_vars set to 15 that was in cause.
Just setting max_input_vars to 1500 was solving the issue.
The migration to php7.4-fpm just happened to be unsucessful at first.
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