Blank or Black Previews in the ON1 applications are usually the result of out-dated or unsupported video cards.
You can check the driver details in your ON1 Log file by going to the Help menu in the Application:
Help>Show ON1 Log.
If you go to the end of the log file, you should see something similar to the screenshot below:
In the above example the video card is Nvidia GTX 960M and the installed driver verion is 388.57
(Note: This will vary depending upon the installed video card, such as Intel, AMD, etc)
Windows OS has indicated to the user this is the current driver. But it is not.
If you go directly to the video card manufacturer's website (in the example, Nvidia) and manually check for new drivers for this video card, you will see there is a much more newer driver available: 436.30
View this knowledge base article for: How to Update Video Card Drivers