AFAICS the functions qa_get_request_content_override_3_in_qa_sig_overrides_php() and qa_get_request_content_override_2_in_qa_cv_overrides_php() don't appear anywhere in the code of Q2A 1.8.4 or above. What version(s) did you try this with, and what plugins do you have installed? Did you try with all non-essential plugins disabled/removed?