Crusader Kings II shows as one of the games you should get credit for and after running it for an hour or so and quitting, Raptr optimized the game a few hours later. But it didn't give me the 20 RP for first-time optimization. It did properly credit three other games that optimized afterwards though.
Although I wasn't able to resolve the issue for you, I did grant you 20 RP since it's not a huge amount. If you manage to get the RP reward for it in the future, feel free and keep the 20 RP.