I also dropped this issue with Netcraft. Their answer:
*This is a known issue with the Netcraft Extension. We've implemented a fix which will be included in the next update. In the meantime, you can continue to use Netflix with the extension installed by disabling 'Block credential leaks' in the extension's options.
These options can be found by visiting opera://extensions and clicking 'options' under the Netcraft Extension.*
Hope this helps.