Mysterious "icon?" file in Dropbox folders on New Macbook Pro

So just set up a brand new Macbook Pro and have one mystery that seems OS related. When I synced my existing Dropbox account to it, I first noticed that all the folders (whether shared or regular) within my Dropbox are regular blue folders. In the past, and on my other synced computers, the shared folders displayed a custom folder with a three people icon. I later noticed that within each shared folder is a zero K file titles "icon?" These two things seem like they must be related.

On the Drobox forum they speculated that it might be a permission issue, and wanted me to an "advanced uninstall" of Dropbox that involved typing in all kinds of terminal commands that I didn't want to get into on a new Mac just to correct folder icons. But it is really nice to notice at a glance which are client shared folders and which are my regular folders.

Any ideas on what might be going on, or an easy fix?