Pete, sorry for the delay in getting back to you. Our support hours are Monday - Friday 9am - 5pm PST (GMT -8).
A couple of your PHP.inni settings are suspect. memory_limit, post_max_size and upload_max_filesize should be set as Megabytes, it look like you are setting them as kilobits.
Make sure they are set properly in the php.ini file, for example:
memory_limit = 256M
post_max_size = 10M
upload_max_filesize = 10M
Brian, you beat me to the punch, I was about to suggest creating a simple upload form with only a file field and Digital File pro on it for testing. Do not include any image resizing and try uploading a small file to see if file uploads will work on the server. If uploads are working using this test, we an progress into troubleshooting your other page.