Coupon code stopped working

Coupon code has stopped working on the join up. I was using this code but it now no longer brings up the box in the frontend to enter a coupon code:

[s2Member-Pro-PayPal-Form level=“1” ccaps="" desc="$25 AUD / One Time (for 1 year access, non-recurring)" ps="" lc="" cc=“AUD” dg=“0” ns=“1” custom="" ta=“0” tp=“0” tt=“D” ra=“25" rp=“1” rt=“Y” rr=“0” rrt="" rra=“2” accept="" accept_via_paypal="" coupon=“yes” accept_coupons=“1” default_country_code="" captcha=“0” /]

Any ideas why it might now not be working when it has been working for years?

Thanks

Stupid idea, but please check if your coupons are still valid. If no coupons possible, there may not be a coupon box on the form.

Found the problem - there was a conflict with the plugin '‘All In One WP Security’ deactivated and reactivated and all is working find now.