Thank you for your help, but it's a little too late. :)
Since I couldn't play a lot saturday, I've managed to re-rent the clubs sunday night, just before the end of the free rental period, to play tonight... I had a 3 hours window for that, now it's gone. :D
Not easy to explain the bug in english and I didn't think to take a screenshot (silly me)... But globally you're right: There was too many clubs (expired or close to expire) in the list to access to the close windows bouton. So, it stay in front of my inventory and I couldn't change expired clubs (empty slots) with clubs in my bag, and, by the way, couldn't play. For now, all my rented clubs are expired, no more "account notification" window, and I can access again, normally, to my bag.
I think you can solve this just by adding a scroll bar in the "account notification" window.
And thank again for this free rental period. It was too short, my scores were terrible, but it was a lot of fun!
nb: Please excuse my terrible english.