So problem finally solved!
I would never have even thought of looking at the encoding issues of a file, the first time i've come across such an issue!
Indeed, it was not a character that was the issue, but the entire includes/classes/ajax/zcDPU_Ajax.php file being encoded in UTF8-BOM.
I opened the file in notepad++, changed the encoding to standard UTF8 and saved, and worked instantly!
Thank you again for your patience.



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