so I've made a first insall on my personal WP site where the donation part worked super well. There were kinks of other sorts (design and data management) but as long as payment goes, it was perfect.
Now, I made the real install and PayPal will not processs my transaction, that there is an issue with the address, which is odd. It is the same I've used on both installs.
Before installing that new one, I've removed the other one that was on pbg.im. This one is on coursedelit.com
Before calling you up to the rescue, I tried configuring IPN (which I didn't in the first test install).
Not sure to understand what is happening...