Bryman, because nobody can reproduce the results you're getting they must surely be related to your location, your computer set-up, or your broadband connection. The fact that Heather in Australia also reports a visual anomaly - albeit a different one - supports this, as does the fact that if I log-in to your account and click the Search button it works exactly as it should, despite repeated attempts.
There is no further investigation I can do, since everything works as expected here. However you could try using a different browser, a different computer, or a different broadband connection (though as it's only a cosmetic issue it probably isn't worth spending much more time looking into it).
By the way, if I click the Search button when I don't have a subscription it takes 17.7 seconds to produce the results; it takes just 10.8 seconds after subscribing. However I've only entered just over 1600 relatives, so I'd expect it to take longer for you.