Hi,
I’m using a 37″ monitor and the Chrome and Firefox browsers.
Generally to check out a themes responsiveness I usually just adjust the browser window to be narrower and then check that everything has resized correctly. For an initial test that’s a lot easier than using a mobile/tablet.
That’s always worked in the past but with the Blanco theme when I make the browser window narrow after a certain point the browser window just goes blank.
This is the only theme where I’ve experienced this issue. This occurs both on my staging website and your WPEC demo site (https://www.8theme.com/demo/blanco-wp/?page_id=20070) as well.
Maybe this isn’t a valid test (?) but it works everywhere else.
Regards,
Mike.