If OpenUpper is not opening all your web pages, your browser may be blocking pop-ups.
Chrome will show a little "Pop-ups blocked" image and message at the right edge of the search field. Click that and select "Always allow pop-ups and redirects from www.openupper.com". It should work now.
Firefox will show a message if it blocks pop-ups from OpenUpper. Click the Preferences button next to the message and click "Allow pop-ups from www.openupper.com". It should work now.
Browsers change, so it these solutions don't work, search for "control pop-ups" for your browser to get the latest information.