As mentioned, this should be sent as to the admins via "Contact Us" under the green question Mark list.
I usually go onto Urban Rivals on a Mac, and I occasionally have this problem. I usually do not have the problem but either when my personal Wi-Fi network is getting high usage, or the Urban Rivals website is getting a lot of traffic, I cannot seem to see the home page. I am on Google Chrome.
Would you care to say which browser you are using?
The Urban Rivals team is made by lovers of all kind of Collectibles Cards Games and Trading Cards Games like: Magic the Gathering, Dominion, Vampire, Yu-Gi-Oh!, Pokemon, Wakfu TCG, Assassin Creed Recollection, Shadow Era, Kard Kombat and Might & Magic Duel of Champions.