Since today (2014-11-10) I also get a lot of SSL errors on many different sites. I can't confirm this error for the website mentioned above, but for several others I get the exact same SSL error.
I'm using Opera 12.16 on Ubuntu and there must have something changed related to the SSL handling. I can't even inspect the SSL certificate – instead the error message is the only thing I see.
I'm getting »Secure connection: fatal error (1066) / Unable to verify the website's identity (OCSP error).« or, if I disable: OSCP »Secure connection: fatal error (49)« for example on the following sites (all via HTTPS):