We are using Membership with the PayPal gateway. We've configured the IPN correctly and it works but it only seems to work about 10% of the time. We have a large number of users who have registered via PayPal but in most cases, while the account gets created in Wordpress, it fails to add the subscription after they complete the PayPal process. So this leaves me with two problems.
1) How to I ensure that the subscription registration process completes properly?
2) How do I properly fix the accounts that did not complete properly. I noticed that in some of the video docs it says that manually setting the PayPal gateway could be problematic.