You will need to make sure that the input into the computer is chosen so you can see on your computer screen what is under the document camera. The document camera software can not be running in the background as this will not allow GRADECAM to grab the picture for the scan window. Make sure the latest drivers are uploaded for the camera. Is your scan window black?
Did you see these notes at the bottom of our camera page?
If you have a AverMedia camera, please download its latest patch:
Please make sure your current AverMedia software is not running and your camera is not connected to your computer when installing the Aver+ update.