I was battling to solve same issue and solution that worked for me:
1. Control Panel> Hardware and Sound>Devices and Printers
2. Remove External Hard Disk
3. Eject Hard Disk
4. Plug it back in
All done with dropbox running and open on the background, and boom, it triggers the pop-out \"Do you want to backup your external drive?\"
Syncing...
","body@stringLength":"415","rawBody":"I was battling to solve same issue and solution that worked for me:
1. Control Panel> Hardware and Sound>Devices and Printers
2. Remove External Hard Disk
3. Eject Hard Disk
4. Plug it back in
All done with dropbox running and open on the background, and boom, it triggers the pop-out \"Do you want to backup your external drive?\"
Syncing...
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