Just created some new folders and files on my oft-used NAS, which is synced with Dropbox through Boxifier, and has been for months. None of the new folders and files created today are syncing; in addition, Dropbox reports an error (in Dutch), which translates as "Can't upload - Please give access".
Some new folders were created with a C# application I'm developing, so I initially thought that might be the issue. But the same happens with folders created manually, and with files created manually.
It does only happen with one particular folder on the NAS, mapped to a drive letter, and its subfolders.
In five other folders on the NAS, mapped to other drive letters, new items sync without issue.
I've rebooted the system, so all file and folder locks have been released, and both Dropbox and Boxifier have restarted.
What's going on here?