Hi,
No, my transactions are from a website via paypal and back (via IPN).
But I was interested in the issue since I'm trying to convince a customer of mine to add paypal to her site (*) - using buy me now buttons created on the paypal site, so I may encounter the problem at some point.
Cheers
Charles
(*) this has, of course, nothing to do with the fact that paypal developers get a commission for each sale made on a paypal enabled site (up to £750)