I'm facing several issues with CBSubs recurrent payments:
1. curl is configured but CB says it's not: "curl executable not available or not configured." It seems to be looking for <span>/</span>usr<span>/</span>bin/curl but I'm on Win XP.
2. When setting up recurrent payments with paypal, despite setting "Auto-recurring renewals" in the Plan, the user is never presented with the choice to manually or auto renew during registration process.
3. Recurrent payments with paypal sandbox go through on paypal side but CB reports "IPN payment gateway communication error", when user navigates back to my site. Log:
$error='';
$status='-100';
$transaction_info='';
On the front-end after completing paypal payment and coming back to the site, the user is getting 500 error.

Reloading the page from the browser takes the user back to the site but registration status remains as "Registered Unpaid".

4. For my monthly recurrent plan, I'm getting Paypal error: "The link you have used to enter the PayPal system is invalid. Please review the link and try again."

Some of the values submitted:
<input type="hidden" name="item_name" value="Monthly for user1" />
<input type="hidden" name="item_number" value="S8-52-2" />
<input type="hidden" name="p3" value="1" />
<input type="hidden" name="t3" value="M" />
<input type="hidden" name="a3" value="7.00" />
<input type="hidden" name="src" value="1" />
<input type="hidden" name="sra" value="1" />
<input type="hidden" name="modify" value="0" />
<input type="hidden" name="currency_code" value="USD" />
<input type="hidden" name="no_shipping" value="0" />
<input type="hidden" name="custom" value="8" />
<input type="hidden" name="no_note" value="1"


Communication is done with the 'plain text' option.
The gateway and the plan are both set to support single and recurrent payments.
Joomla version: 1.7.2
CB: 1.7
CBSubs: 1.2.2
curl: 7.21.7
php: 5.3.8
xampp: 1.7.7
localhost with Paypal sandbox business