Hi Paul,
Here is the error I get when using the comma. For me, the error is the same whether I use the comma or not. I haven't seen the error you posted, with the "geocoding failed" message.
The "bad" weather file that is saved into my weather directory is the same as that which I uploaded yesterday. I have tried with other cities too, such as Newport News, VA, with the same result. I have also tried clicking on "Advanced download" and selecting specific weather files. In that case, I don't get an error, but the downloaded weather files all have "bad" appended to their names, and are essentially the same as that which I uploaded yesterday.
Thanks,
Evan