Renderworks Styles come out solid black/grey

[Dcrb]

I'm using Vectorworks 2021.  In the file I'm working on, every now and again I have been checking a view with realistic exterior fast, renderworks style.  This had been working fine, but now  when I select realistic exterior fast, or any other render works style, it starts as if it's going to do the render properly, but then covers everything in solid dark grey.  I don't understand why it should suddenly stop working?

 

[MaltbyDesign]

Could it be your shadow settings in the render style? 

[Dcrb]

Sorry I don't think I know anything about shadow settings in render styles.  How can I change the settings?

[Tom W.]

@Dcrb do you have Lights in the file that have been turned off? Check your Visualization palette. As soon as you put a light in a file this takes over from the default ambient light + from then on you're relying on the light objects to illuminate the drawing. And if these are all turned off it will be dark

[MaltbyDesign]

@Tom W. I meant to suggest that as well and having the light source turned off seems the most likely problem. @Dcrb some of the render styles have the ability to turn shadows on or off in their preferences.