Please search for any relevant crashlogs. To search for crashlogs:
open new finder window
We are looking for anything with gpg2, Mail, GPGServices, GPG Keychain, Libmacgpg or pinentry in the name. The date indicates if the crashlog is fresh or old. Very old crashlogs may not be relevant, since a new version of GPG Suite could already have fixed the problem.
Repeat above steps but this time paste '/Library/Logs/DiagnosticReports' and again look for relevant crashlogs.
When you find something relevant, please attach the crashlog to your existing discussion.
Can the crash you are seeing be reproduced by taking certain actions?