I also saw quite a few errors, such as the logo I was supposed to be coloring being very out of place from the center of the page, or off to the side. Also, my "average" score seems to have been calculated in a very odd way. It looks like this: http://puu.sh/LniU
* I picked a color for IBM that was almost perfect (it barely darkened just a bit when I submitted), but it gave me a 3.14.
* Dropbox's logo is colored pretty differently depending on where it's displayed (I colored mine lighter, like the system tray icon, rather than darker like the logo on their homepage).
* For Apple, I tried just submitting without making any changes because it looked pretty close to correct already. I was given a 0%, even though it only barely changed.