iTunes 9.1 asks permission to accept incoming connections every time

Since upgrading to iTunes 9.1 I'm being asked every time I open it if I want to allow incoming connections. Each time I respond yes, enter my admin name and password and everything is fine. The next time I open it it asks again. I've tried going to my Security preferences, deleting iTunes from the firewall rules and then adding it again, but this has no effect. Anyone else getting this?