This problem came up a few months ago when Verisign went a bit weird. Opera does extra checks (OCSP) to make sure that a security certificate is still valid. If this check can't be made, then it assumes failure and so stops the whole thing. Close Opera, then TEMPORARILY add the following line to your opera6.ini, under the [Security Prefs] heading: OCSP Validate Certificates=0 The .ini file is the one usually found in [...]/Opera/profile/ Then start up Opera again and you can checkout without problems. When you're done, you should close the browser again and remove the line.