If the above doesn't help, try adding a WAF exception for com_jce, as described in the documentation's example. In fact, that feature was developed in cooperation with JCE's author in order to work around some issues with front-end editing.
Regarding the tickets, what kind of error do you get? I can see that you have full permissions for the ticket system. Other users with the same permissions were able to submit tickets. If you give me the exact error message I might be able to find out what is going on.
Nicholas K. Dionysopoulos
Lead Developer and Director
π¬π·Greek: native π¬π§English: excellent π«π·French: basic β’ π My time zone is Europe / Athens
Please keep in mind my timezone and cultural differences when reading my replies. Thank you!