When accessing secure websites, Opera checks with a number of services to check if the website’s security certificate has been revoked. Normally, if Opera cannot check revocation status, it will not present the site as secure. In some cases, a failure in one of these services can cause Opera not to check other services. In this case, Opera might present the site as secure, even though it failed to complete checking the revocation status.
Opera Software has released Opera 12.10, where this issue been fixed.