I have a problem that I have only just noticed in the last few days.
I seem to have two duplicate Dropbox folder structures that are 99% the same so it's hard to tell which one is which but the files and folders don't sync.
I run MS10 on a Lenovo G50 and in the folder menu, there are 3 different ways to access Dropbox.
One is accessible via This PC > Documents > Dropbox. This isn't synced to my phone I have just realised. It appears that sometimes certain programmes (Adobe in this instance) save to this path rather than the Dropbox that is synced to my phone/backed up etc.
The other method is via Outlook Team > Dropbox. This is also accessible via the Desktop/Folder menu
The folder structures are almost identical but this second path is linked to the phone and synced. I've only just noticed this.