Game not showing up in my library

[klogw]

I got the game free during steam giveaway, my hard drive is about to die, I wanted to backup the game but it doesnt show up in the library, however it is there when i click on "games" on"my profile" or when i check the account details. Its alreay installed too...
So whats the problem?

[Frodofaggins]

login out, and in to steam.

[klogw]

i just found it by luck. looks like the game was hidden, and steam not showing a proper list of hidden games didnt help at the time.