After this experience, I'm just a little concerned that this illustration I've been working on for the last two weeks may either be ruined or I may now ruin it out of ignorance.
Why? That's why people use incremental saving and versioning. Just work on a copy of the current state. The rest is not clear, but I suspect you somehow inadvertently mixed RGB and CMYK or spot colors and thus the blending of the colors gives weird resuts. Expanding the artwork may offer a solution, if not the most practical one. Anotehr may be to run it through the Recolor Artwork process to get clean colors. the only real stinker with gradient meshes is, though, that you first need to select the gradient points for it to have any effect on them...
Mylenium, thank you for your help. I checked Document Info, and it lists only RGB - no CMYK, grayscale or spot color objects at all. Checking one of my older versions that had not been fixed showed the same except it did have some grayscale objects in addition to the RGB.
I did try your suggestions on the older version, and the Recolor Art worked. That removed the offending object filled with the "Fade to White", and that made things look right in Flattener Preview. I also tried to repair my illustration with your suggestions; however, they had no effect on the jaggies I'm seeing. I suspect the jaggies may be a different issue.
Anyway, thanks, again for your help. Much appreciated.