DropBox Download Error

I'm using the TMS Cloud Pack Demos\StorageDemo - using DropBox. I get the file listing and I can upload. However when I try to download a simple text file that is in the root, the file contains the following:

404 Not Found
The resource could not be found.

I was using an older version, so I updated to the latest version (2.5.6.1) and I still get the same problem.

So far, I have been unable to reproduce this.
Is there something special about the file name? Special characters? Something else special?

This suddenly started working without any code changes. Really odd. The file names were "File1.txt" and "copy.txt". So nothing special about those.

Perhaps this was a temporary glitch at Dropbox.