If you are using a Plustek Opticbook 3900 or 3800 to scan, Read&Write you may not be able to access the Scanning Options or Read&Write may stop responding when the Scan button is clicked.
Plustek have released a driver that includes Read & Write support. To resolve this issue, go to the Plustek Website and search for your scanner. Download and install the driver that includes Read&Write software TWAIN protocol support.