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It seems you have deleted this form http://www.jotform.us/wrapaloc/photo_contest already. I could not test it anymore.
I checked the other jotform http://www.jotform.us/form/43046281791153 instead.
When I tried uploading an image file (jpg file type), the upload fails as the upload field was not able to recognize the image file extension type.
To fix the upload file type issue, update the upload field file type extensions property. You can use asterisk instead to allow universal file type.
when I did this modification, I was able to make the upload field work on test form
Review this user guide also http://www.jotform.com/help/29-Upload-Field-Allowed-File-Types
Hope this help. Inform us if issue persist.
I tried to create the form again, but i am having the same problem.
I checked your form and the fix my colleague recommended does indeed resolve the issue. Since it was a quick fix, I just went ahead and made the changes in your form. You should now be able to use the uploads fields as normal.
If you are still having trouble with your form, let us know and we will be happy to have another look.