Re: (setq blink-matching-paren-dont-ignore-comments nil) ignored?

[Richard M. Stallman]

    (

    ;;;;;;;; ( <=== This is skipped

    )<-- Point

    When point is at the position marked above, the correct paren will be
    matched if the value of this variable is nil. Useful. However, when I
    set it to `t' it still skips the one in the comment.

The blink-matching-paren feature shows you the matching open-paren
when you insert a close-paren.  So try this:

    (

    ;;;;;;;; ( <=== This is skipped

and insert a ).  You will see that this variable takes effect.