Hi

gif is limited to 256 colors [also called '8bit'] - if the color you want is not one of these this might be causing the problem.

to check this - export the logo as a png or jpg and make sure that the color is '24 bit' [also known as 'true color']

I do not have corel draw so I cannot be more specific sorry, but there should be an option to set this somewhere.

Like Red says - check you are exporting as RGB.

Also - 96dpi is fine for web - 300dpi will make no difference except to increase its size, and would only be necessary for print

Hope this helps