Try following these steps:
- Revoke your existing iOS Distribution Certificate from the iOS developer website.
- Generate a new iOS Distribution Certificate by going to XCode Preferences->Accounts->View Details and then clicking the + underneath the list of signing identities.
- Go back to the developer website and make sure all your provisioning profiles are configured with the new certificate. (They should all be listed as Active when you are done.)
- Go back to XCode and refresh your list of provisioning profiles.
I had the same issue as you did and this resolved it just fine.