The game's not broken. The hint system is messy. Sometimes the question mark doesn't tell anything because a quest/path doesn't exist yet/hasn't been completed yet.
Are you using a mod? or using a different version? perhaps old saves? Have you modified the game in any way?
My book of faces is spot on, I have gotten to the point where it says "There is no more content available" with a few minor issues.
Perhaps new bugs have developed earlier in the game due to updates, I don't know. But I've had to restart my entire playthrough before due to an old save issue. Either way, it is incredibly likely that its simple fix by placing the keywords of your problem into the forum search engine.
The game has its issues and its not perfect by any means, but it is far from impossible to play.
*Edit* Are you talking about the game store?