My account that is sharing is not active nor is anyone else playing the game.
The two titles that wont allow me to play are Counter Strike: Source, and Half life 2
Steam – I family shared all the games, but two of them say buy instead of play
steamsteam-family-sharing
Related Topic
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Best Answer
There are reports of Valve games being shareable when purchased independently. However, the games appear to not be shareable when purchased as part of a bundle (e.g. Orange Box etc).
Sources:
https://steamcommunity.com/groups/familysharing/discussions/1/792924412322347539/
http://steamcommunity.com/groups/familysharing/discussions/1/792923683632096521/
http://steamcommunity.com/groups/familysharing/discussions/0/792923683796413789/?ctp=11