CobianSoft

En las propiedades del fichero (p las carpetas) veras los permisos.

If you start the interface: do you see the process in the task manager? (Cobian Reflector User Interface)

Que permisos tienen los ficheros? Que usuario está ejecutando el servicio?

Copias completas a conservar: 4

I don't really know how Dropbox works but if it works like OneDrive or Google Folder, then the files are only online and what you see in the file system is a placeholder (which you can make offline if you want).

Hmm... Options-Log-Mail as attachment

Surely not a permissions issue but perhaps the file is offline (at the cloud only).

What you are seeing in the task manager is problably the application window (which is hidden), not the interface. The interface has its own process.

Just don't clean the archive attribute in the first task or don't use the archive attribute at all for the second task.