Hi Kevin,
I just had a chance to test Dia on Mountain Lion.
After optional X11 install in Snow Leopard and a default
installation with Lion, Apple has removed it in Mountain Lion:
http://support.apple.com/kb/HT5293
* Please install X11 (XQuartz) first - you may even have to logout/login
or reboot after this.
http://xquartz.macosforge.org
* Try to start Dia again. (The Gatekeeper hint might still be relevant).
Using this approach, the Dia App was running on my Mountain Lion 64bit
test system.
Regards,
Steffen
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