I had the same problem with my Smugmug site. Exchanged many emails with them over the "dull and wrong" colors I was seeing on my MBP. The colors are only displayed properly when the gallery is viewed as a slideshow. The responses from Smugmug seemed to point at Safari and the correction they suggested didn't make much sense.
So, I downloaded Firefox and bingo, no more color issues. The gallery pics view the same no matter which Smugmug Gallery Style I pick. BTW, they look like the slideshow representation in Safari, i.e, the correct colors.
I only recently switched to Mac, so I'm not a expert on their software. However, I have moved away from many of the free stuff that comes with the Leopard OS, such as IDVD and Safari.
jr