Capybara does not follow redirect if the page is changing due to a change in window.location. This is typical in backbone apps.
current_path only changes after an HTTP redirect.
As a workaround, you can test the content of the destination page.
For example, when writing cucumber steps, if the other page has a "browse" label, you can test it with:
Then I should see "browse"
Then I should be on the browse page