Following up on a submission -- advice?

So, there's a certain pro magazine I've submitted to before, and I've always gotten a confirmation e-mail within an hour of using their webform. Didn't happen this time. They have an e-mail address in the event that the form doesn't work, so when the better part of a day went by with no confirmation, I used that as well.

A week has passed and still no confirmation or acknowledgment of any kind. It's a monthly themed magazine, and I wrote my story specifically for last month's theme. So, what do you think? Follow-up or not? I know based on previous submissions that they probably have not yet started reading for last month's theme, but will more than likely start soon.

EDIT: Made a decision on this already. Appreciate the space to type through my thoughts.

Thanks. I have actually e-mailed twice at this point (once to re-send the manuscript, as per their website directions if the form wasn't working, and once as a follow-up). I may try once more time after this, but after that, I'm not sure what else to do.

It's certainly frustrating and I'm mostly hoping at this point that the staff are just very busy and haven't seen my e-mail yet.

I appreciate everyone's input.