Running Windows 7. Installed desktop app. Put icon in task tray. Click on icon and a Windows Explorer window opens showing the contents of my Dropbox folder on my C drive. I can successfully put files into this folder and view them on the web, so it is syncing. Here's the problem: The graphical user interface on my desktop (similar to the web site) does not open. Oddly, I had it running earlier today, but I had to uninstall Dropbox and reinstall it using another email address. Since then the GUI doesn't load. Baffled.
Walter solved it. I had to go the the DB icon on the right of the task tray, right click on that, click on my user icon on the upper right, select Preferences/General/Open Folders in [Dropbox desktop app]. Thanks Walter