Pay per View : Will not process anything through Paypal. Invalid Regular period. You must specify v

Hi there -
I've installed the Pay per View Plugin, and am getting a Paypal error:

Invalid Regular period. You must specify valid values for the A3, P3, and T3 parameters for a subscription.

for Daily Pass or Recurring Subscription.

I am also getting a Wordpress error:

[Pay Per View] If you are using Daily Pass or Recurring Subscriptions, you need to enable and set API logins.

even when API logins have been set. Both errors display whether or not I have Facebook/Twitter login enabled.

The One-Time View gets to the last step of Paypal, then returns you to the previous page without ever processing a transaction.

Please help! Thanks!
Kelly