I was relying on what Erik wrote about a couple of months ago ...
StupidDrip95 wrote a thread entitled: How come we cant choose what color we are in live anymore?
Erik wrote (in one of a multitude of similar threads):
the reason is that some people are abusing the option to just play white only. as an example we found one member who had more than 1,000 games as white... and 19 as black.
who goes around at a chess club and says "i'll play you, but i get white". it doesn't happen. you sit down, then you decide by luck who plays white, and you setup and play, then reverse when you are done.
if you want to play one particular color you can do so as unrated (for practice), or you can directly challenge someone with a specific color.
i'm open to hearing reasons for adding this back, but removing it removes abuse and confusion.
and also ...
"Anyway, we've discussed it and are not going to make any changes. Instead of spending time programming a feature that helps a handful of people (that we disagree with), were going to remain focused on things that benefit everyone equally."
Was the game rated? Colour choice is only supposed to be available for unrated games.