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I've started to use Opera, but cannot load Gmail, because of a 'Cookie setting' problem. When I try to load it, I get the following message:

We've detected a problem with your cookie settings.

Enable cookies
Make sure your cookies are enabled. To enable cookies, follow these browser-specific instructions.

Clear cache and cookies
If you have cookies enabled but are still having trouble, clear your browser's cache and cookies.

Adjust your privacy settings
If clearing your cache and cookies doesn't resolve the problem, try adjusting your browser's privacy settings. If your settings are on high, manually add www.google.com to your list of allowed sites. Learn more

I've set the browser to allow cookies, but I still get this message.

Any ideas?