I've installed the same developer certificate onto three different Macs. When viewed in the keychain (or in Xcode) on one Mac it says its revoked, on another it says its not trusted, but on a third there's no issue reported.
How could there be a difference between the three Macs? (Both Macs have the date/time set to be the same).
Can 3rd party software, VPNs etc. interfere in this at all?
