Ensure you install the Firefox or Chrome extension for the block reader. One the extension is installed you should see the following icon in your browser toolbar:
After you have installed the Ensync.msi package, ensure the application is listed in add/remove programs:
Did you install the Ensync.msi package as administrator?
This application makes certain edits to the registry so ensure the account running the installer has the permission for registry edits.
Did the package install correctly?
Check that the registry key is defined. Use regedit to do this.
When you click on the Scan RFID button at the top, does the connected RFID block device beep?
If so, the plugin is sending a request to the block device, but the reader is either having trouble reading the given tag or the tag is not in the system. Ensure that the RFID tag is centered on the sensor. If there's a visible metal inlay on the RFID tag, flip the tag over to ensure the sensor is directly over the metal inlay.