If you, like me, have OneDrive Personal and Business on the same machine, chances are that the green ticker/check mark is missing. All files syncs just fine, but no green check mark.
I have found two solutions:
For me, the Reg Hack did it. I have a Win 10 box thats been upgraded from win 8.1 so I simple had to many overlay entries in the registry – even some SkyDrive entries that I had to delete.