Adding *dropbox.com to the exclusion list doesn't help, nor does actually closing Dropbox or temporarily disabling the web shield. It seems that once you try to synchronize a file, the process can't be stopped without a restart of the computer. My bandwidth usage was CRAZY yesterday. What can it possibly be uploading when Dropbox is closed? I notice my Avast icon in the system tray going nuts but I don't understand what data is even being transferred, or why it would be.
I'm running Dropbox v2.4.11