I am seeing a few entries into the log toinght that have a blank url. The script was still giving results, but I have now made it return "INVALID URL". I have to do this to make sure the script does not become abused. It's ok to track now, but a few months down the road it will be impossible.
You can register more than one key for different urls if necesarry. I know some of you use testing servers taht have different urls. I'm not sure what would cause a blank url to come through. I read the url from the http.referrer method in asp. So if the script is called from a page in the url you generated the key with, you should never have a problem.
I may put a property in to the script to allow you to test what ur server is seeing by having it return the key, url, acct etc. This way if you do run into a problem, you can turn on a 'debug' mode to see what we are seeing.
Right now, it is only one account having this issue. I also see that account is working fine from their website. So I assume they are testing something or trying something. If it's you and you have any questions, please post them here.
Ben Newton