When you go to the Activity tab of a Recurring gift, you can view the installments of that gift. If there is an existing payment, you can go to that revenue record by double clicking on the payment in version 4.0. In version 3.0 this was a hyperlink.
We're currently evaluating this issue for a fix in a future patch or service pack.
Steps to Duplicate
Go to any Recurring gift that has at least one payment
Select the Activity tab
Expand the installment that has a payment
Observe the payment is displayed, but it is not hyperlinked
In version 3.0 the Payment is a hyperlink to the payment record