I don't have the same problem as you, Trekker 4747, in having people report these issues. I just wish that people would describe for us lay people what the issue is.
I had an issue with the planet Gravesworld. This is a screencap of the planet - http://en.memory-alpha.org/wiki/File:Gravesworld.jpg
. When I see this image, I imagine a person focusing a flashlight beam on a globe. It looks unreal, and is very noticeable in the episode.
As for the shot of the nacelle, what is wrong with the image?