Why is there such a difference in the editing view & save preview views? I am using Adobe Illustrator CS6 for Mac OS X.
Color Settings: North America General Purpose 2
Export Format: PNG-24
What it looks like to me, is one of two things...
Solve: Under file, check your document color mode and make sure it's set to RGB, illustrator defaults to CMYK for print and you should be able to change that in your preferences if you want.
Solve: Under view, make sure proof colors is unchecked, or under view you can go into proof setup and select sRGB as your proof setup, and that should match your color space.
Additional Notes: You might also want to open your color palette and make sure that is set to RGB in the options menu at the far right of the palette.