Plain text editor ,Tinymce problem

[Komorac]

Pozdrav, imamo ovaj problem na stranici, nemogu otvoriti plain text editor tj ne vidim nista osim praznog prostora na visual editoru, pise broj rijeci kada odem na edit ali nista ne vidim…. svasta sam probao ali nisam ocito dovoljno sposoban da ustanovim i rijesim problem, pa bih molio pomoc.
Na inspect elementu ovo pise..

Refused to execute script from ‘http://www.xxxxxxxxx.com/wp-admin/admin-ajax.php?action=stm_editor_buttons_js&wp-mce-4109-20150505’ because its MIME type (‘text/html’) is not executable, and strict MIME type checking is enabled.

probao sam i deletat coockies ali ni to nije pomoglo