Paypla Problem

Paypal Problem

I've setup two subscriptions, 1 day, and 30 day, both exactly the same apart from the duration.

Paypal processes the 1 day no problem, but when I subscribe to the 30 day the error log shows;
paypal_r ERROR: IPN validation error: Paypal claims it is not-valid IPN transaction: []

How come it works for one & not the other when they are set the same?

Strange, I deleted the 30 days, and entered it exactly the same and it works!!!!!