We've had a few problems with the email portion of the submission system. In some cases, you might not have received your confirmation email. Today (June 8, 2013), we did some updates behind the scenes and the problem should now be resolved. This problem didn't affect the actual uploading and storing of your submission, only the email notification portion.
If you submitted and didn't receive a confirmation email, please feel free to get in touch and we'll double check for you.