Since upgrading to Yosemite, I have trouble running GPGMail with my Mac. When hitting the New Mail button Mail simply crashes.
Crashed Thread: 0 Dispatch queue: com.apple.main-thread Exception Type: EXC_CRASH (SIGABRT) Exception Codes: 0x0000000000000000, 0x0000000000000000 Application Specific Information: *** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<HeadersEditor 0x7fb0b6584680> valueForUndefinedKey:]: this class is not key value coding-compliant for the key _composeHeaderView.' abort() called terminating with uncaught exception of type NSException
However, there is this single thread in the GPG support forum, someone had the exact problem, while support pointed out there is some Yosemite beta of the GPG tools. Just in time, GPG Suite Beta 4 was released, and it works like a charm.
In case you are looking for the public key, pick it up here.