What version of the namecoin client are you running? How are you handling the issue whereby namecoin has a small hash rate and an attacker with >51% of the network can effectively deposit namecoins, trade for bitcoins, withdraw the bitcoins, then reverse the deposit?
Last updated version is 0.3.24.63.
We will keep an eye on what is going on with namecoin hash rate. In case of possible attack we will pause namecoin operations. If a successful >51% attack does happen - we will try to cover the loss up to the limit that we can afford, but we do not guarantee full coverage since we are not a bank or any other financial institution, unfortunately. These are the global risks inherent in the Bitcoin-based architectures. The one can either accept them, or should not trust crypto-currencies at all.
This is also the exact reason why we do not accept any of the alternative currencies. But we like Namecoin and we are ready to give it a chance.