It's Toshi over at UC Irvine. I have a very similar problem with my HD1010. I followed all the instructions above, tried it with a dropbox account using your "trick URL" method, as well as our school-hosted webfiles service. All I get is a blank screen on my display. I don't even see the red "err" light go on, and when I check my flash card, I don't have a "log.txt" file. I also tried it with the second slash (from the comments above) and without. I can ping the box on the network.
Here is my current-sync:
<?xml version="1.0" encoding="utf-8"?>
<sync version="1.0" name="Simple Networking">
And the settings from my Unit Setup:
You should be able to click on my directory https://webfiles.uci.edu/toshi/Brightsign and see the files in there.
I must be doing something wrong, I just can't figure out what. Thanks in advance for your help!