I just set up the online wallet at Myzenwallet.  Sent 1 zen to test it out... Received the Zen no problem but when I try to send Zen back out I get the following message.

"Error. Error: Request failed with status code 400"

And yes... I am trying to send out less than my total amount and have tried using 0.001 and 0.002 as a transaction fee.

Thanks for any help in advance.