Darius Chroma Selection

I recently purchased the Darius Chroma Pack and tried to select it during Champion Select in a Dynamic Queue game. I can see the squares where you can click and choose the color but I am unable to actually select any other than the normal skin. I tried again in a custom game and the same thing happened again? Is there a fix to this? I feel that I just wasted RP on a skin that doesn't work for me.