It looks like this is a known problem with Opera 12.16[1][2]. According to the linked thread, a workaround is to disable opera:config#SecurityPrefs|OCSPValidateCertificates (obviously not ideal).

You might see if it is fixed in 12.17.

I do get an OCSP response if I run:

    openssl s_client -connect takeitapart.com:443 -tls1_2 -tlsextdebug -status

Qualys also shows OCSP is working (though seemingly not part of the A+ rating)[3].

1. http://forums.opera.com/discussion/1773932/broken-websites-t...

2. https://www.google.com/search?{google:acceptedSuggestion}oq=...

3. https://www.ssllabs.com/ssltest/analyze.html?d=takeitapart.c...

Ah, thank you for your time on this. :) I'm sorry to hear it's a browser end problem.