Here, I'm experiencing the same. As for me, locations aside from America(Asia, Europe for instance) worked just fine until 2 days ago. But now every location, including America don't work. Even the symptoms are just as you stated: Us-only series does not appear anymore. Just to be sure I've updated it up to the recent version.
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RE: VPN NetflixOpera for Mac
When I enter Netflix with US location VPN, it keeps getting detectedOpera for Windows
Just as I told in the title. They detect me everytime I enter from US. Europe and Asia works just fine, only US is having trouble. I already updated it up to the recent version, for your information.