iOS XCode issue

[Graeme43]

Hey! Xcode won't let me put apps onto my iPad and iPhone and I think the problem is that my iPhone Developer certificate says it was signed by an unknown authority! I have tried it on 2 macs with 10.6.5 and downloaded it a few times from the provisioning portal on iOS dev site

Anyone know how to fix this? It expires in april 2011 so its not that

I've had it working before

 

[Graeme43]

I installed the WWDR intermediate certificate and that made the developer certificate valid

now I have


Code Sign error: The identity 'iPhone Developer' doesn't match any valid certificate/private key pair in the default keychain
A valid signing identity matching this profile could not be found in your keychain