I have the latest JCE Editor Pro 2.8.18 and can open the 'Editor Global Configuration'. When trying to open an 'Editor Profile' of which I only have one, I get a debug error:
Fatal error: Out of memory (allocated 33554432) (tried to allocate 655360 bytes) in /home/sites/rele.me.uk/public_html/libraries/src/Language/Language.php on line 777
I can click the Go Back button on my browser which returns me to my 'JCE - Editor Profiles'. My browser is Firefox but it also happens when using Chrome.
I have had my hosting people checking things out for me and assuring me there is not a memory issue. After much searching and reading I finally followed your instruction on how to disable the 'System - Admin Tools plugin'.
This cures the problem. I have done this several times and it is repeatable.
I have looked at the .htaccess and WAF comparing it with another Joomla site which also has Admintools and does not have the problem and can not see anything wrong.
I have run out of ideas and do not have enough knowledge to go any further.
Any help you can give me would be greatly appreciated. Robert.