Hi there,
I had exactly same problem (with distribution build, CodeSign and "invalid format") and I spent last sleepless night trying to resolve it.
Finally I created a brand new project ant copied all resources and code from "corrupted" project. I used the same provisioning certificates and - it worked!
So my solution is: copy all stuff to a brand new project, all resources, frameworks and code. It should help. Somehow project in iphone sdk can get awry with no reason :/
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