Without access to the server files and to your Moodle, I am at a loss for what to try next. I have more than one server, so it is at this point when I am having trouble with my own Moodle, I compare one against the other until I find the problem.
Lesson
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Eztabaida hau blokeatu da eta beraz aurrerantzean ezingo duzu bertan erantzun.