Safari and Chrome report invalid certificates on certain HTTPS sites (for example GitHub and Bitbucket). Firefox strangely shows a green valid certificate.
I've created a new OS X user and everything is perfectly valid there. I though that maybe there was some invalid certificate in my login keychain. However, even after removing all certs from that keychain, it still reports as invalid.
The Entrust cert that only shows on my account is present in my login keychain. I removed it, which makes the DigiCert High Assurance EV Root CA the new top certificate in the list, but it is not the same cert as on the working account...
The problem also occurs when using curl or for example pushing with git.
Is there something I'm overlooking?
UPDATE
Everything works after copying the DigiCert High Assurance EV Root CA from the System Roots to the login keychain. But why is this necessary on my user account?
Certificate chain in Safari on my user account

Certificate chain in Safari on a new OS X account
