Try clearing your cache and cookies or (if you have chrome ) go on incognite mode or equalavent on your browser.
If its still doesn't work Send a report on : http://urban-rivals.com/staff/contactus.php They will help you out.
One of things that could be the reason ( Very unlikely ) could be because you are banned from Dts
Urban Rivals | Free Online Manga Trading Card Game | TCG | MMO
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.