On my Paypal account under the History tab I only have: Basic Search and Download History.
When I click on History it brings up all the transactions. On that page I have 2 more drop down tabs, Select that brings up dates and More Filters and there is nothing about IPN.
Checked my forum Url and it does not have a \ :
http://reptile-parrots.com/forums
I followed your link to paypal and read through their instructions and my Paypal looks completely different from what they have. I do not have a Selling Preferences column and therefore do not have Instant Payment Notification Preferences. The bar that they show on that page is also completely different from the one on my Paypal.