I'm also getting the "self-signed certificate" error sinds the last update. I get it while trying to import/upload ISO. From source, commit e52b1 8.3 beta

This is unconditional for a reason. The CSTATE errata in Nehalem are crippling - IIRC a core going in an out of a deep C state does not maintain cache coherency correctly, resulting in arbitrary memory corruption. You really do care about not hitting this errata, even on a test/hobby server.