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.