Impossible to add custom 404 page?

[uwitness]

I've been trying to add a custom 404 page to a site I've built at http://louisbarabbas.com, as the default with a complete sitemap is rather overkill in this case. However, no matter what I try, the default Genesis 404 page refuses to be replaced. I'm using the Dynamik Website Builder child theme.

Methods I've tried:

1. I've uploaded a 404.php containing code for a much simpler 404 page (sourced from here), but nothing happened. I turned off all plugins to see if there might be a conflict there, but still no change.
2. I've tried plugins too - Bill Erickson's Genesis 404 page did nothing. David Decker's Genesis Widgetized Not Found & 404 managed to add widgets to the Genesis default 404, but that wasn't really what I was after.
3. I've also tried adding this code to my functions.php to redirect a 404 not found to any URL on my site, and point it to a standard WordPress page I'd created. Again, no change.
4. Although I realise we're not supposed to edit the core Genesis 404.php, in a final attempt to see if anything could be changed, I went in and edited a couple of words of the default introduction. Even that showed no change.

Anyone have any ideas why it's proving impossible to replace the default Genesis 404 page in any way whatsoever? Completely stumped here. Thanks!

http://louisbarabbas.com

[uwitness]

Sorry, this suddenly seemed to post itself after two days, hence the duplicate. Please ignore.

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