This indicates that the subscription handling script is not getting invoked.
The following means that a subscription signup request was received and it should be hanlded by the subscription signup handling script which creates the member after talking to Wishlist.
[01/24/2010 11:28 PM] – SUCCESS :Subscription signup IPN received… nothing to do here(handled by the subscription IPN handler)
Did you overwrite the “paypal.php” file that was in the Wishlist integration package? Also did you do “step 2” mentioned at the following URL?