Have just noticed that Apple redesigned iOS Dev Center this weekend.
I need to add a couple of devices to an existing Ad-Hoc provisioning profile. But when I push Ed
I looked into this on the forum and found a reference to the new App Distribution Guide. You need to delete your old profile and create a new one. You'll be given the choice at that time to add devices to the new profile. The feeling is that Apple has changed the format of the profile and this is a way of forcing you to recreate a new profile in the new format.