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Home › Forums › Backend Issues (wp-admin) › ACF unable to perform validation due to an invalid security nonce? › Reply To: ACF unable to perform validation due to an invalid security nonce?

  • Just happened to me. Looks like it’s potentially an issue with 6.3.6 according to this thread:

    https://wordpress.org/support/topic/acf-unable-to-perform-validation-due-to-an-invalid-security-nonce/