I am experimenting with the Sketch Render settings and have found some very nice effects when you set the resolution up past 3000 pixels wide.  Basically, the edges and lines form some very nice width variations that are more naturalistic than they are at lower sizes.  These effects come much closer to appearing like real sketches than they do at lower resolutions.

However, I am seeing something VERY odd on some of the renders: the image "crops off" the side of the image. There is a black vertical line and then everything outside that area is only partially rendered.

I've posted a half-size sample image so you can see what I mean.  Note the vertical line that cuts through the second figure, and note how it's not fully sketched on the right side of the line:

http://www.mmitchell-media.com/3d/Render_TestLine.jpg

Can you guys help me figure out what's going on and how to prevent this from happening?

Thanks!