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I've seen this post here before that the browse feature doesn't work when you first launch the web player in Windows. I use the web player with Spotify Unlimited on a laptop running Windows 7. I seem to get a new release nearly every day, and this problem persisits. So what you can do is launch the application, log in, close the application, (you won't be able to log out and it won't matter anyway). Then wait a few minutes or you'll get the dialog box The spotify application is not responding.
Then re-launch Spotify and the browse feature will work.