Is the latest firmware applied to the ScanSnap?
Update the firmware of the ScanSnap to the latest version.
For details, refer to ScanSnap Help.
Are the latest updates applied to ScanSnap Home?
Update ScanSnap Home to the latest.
For details, refer to ScanSnap Help.
Is another ScanSnap unit connected to your computer via a USB cable?
If another ScanSnap unit is connected to your computer via a USB cable, the operation of that ScanSnap may take precedence.
Disconnect the USB cable for any ScanSnap unit you are not using from your computer.