Exactly that. I'm not sure if it's a problem with my computer specifically, but the RAINBOW setting looks off in Vista. And by off, I mean the top picture (where it says Ayumi Hamasaki Sekai A friendly international...) doesn't match the background. The right side's fine, but the left's colors don't match the background's colors.
Now this isn't a huge problem or anything, and I don't really care; but I'm not sure if it's just my computer or all of Vista, and I just thought I'd point it out.

I'm just more curious than anything
Err...now that I think about it, I'm wondering if it's because my laptop's resolution is 1280x800....O_o Maybe?