Pro Forms template= parameter not working

I am trying to use my own version of an AuthNet Pro Form. I’ve followed the instructions here: presale FAQ, can I modify Pro Forms templates, and copied the template into my active theme directory.

Then I’m using a shortcode to insert the Pro Form onto my signup page. The shortcode is as follows:

[s2Member-Pro-AuthNet-Form template="authnet-checkout-form.php" level="1" ccaps="" desc="$25 USD / Yearly ( recurring charge, for ongoing access )" cc="USD" custom="www.copsacrossamerica.com" ta="0" tp="0" tt="D" ra="25" rp="1" rt="Y" rr="1" accept="visa,mastercard,amex,discover" coupon="" accept_coupons="0" default_country_code="US" captcha="0" /]

You’ll see the template=”authnet-checkout-form.php”. I copied the file from the /s2member-pro/includes/templates/forms/ directory, edited it, and kept the same name. The only edit I’ve made so far is a simple text change, just to see if it was working.

The form is still being generated from the /s2member-pro/includes/templates/forms/authnet-checkout-form.php file… and not my custom one.

Any reason why this would be happening? Thanks for any help, or even if you could lead me in the right direction.