Hi Jason,
I am having the same issue. I tried adding the onClick event, but I am still able to place two orders.
<li class="formItem">
<span class="buttonFieldGroup" >
<input class="formButton" name="Payment_submit" type="submit" id="Payment_submit" value="Submit" onClick="clearAllServerErrors('Payment_Standout_Default'); this.disabled=true;" undefined title="Please enter a valid 3 or 4 digit CVV" required="true">
</span>
</li>
Thanks for any help


