On its early access launch yesterday, those who paid to get early access to Halo: Campaign Evolved on Steam couldn't seem to open the game, as it simply wouldn't stop opening up the art book instead. I mean, I enjoy a good art book as much as the next guy, but not being able to play the game you bought on the day it launches sounds like a nightmare to me. Luckily, a fix rolled out pretty quickly.
Forty minutes after reports came in, a member of the Halo team took to the Discord to report "the Steam Art Book issue should be resolved shortly and will only require a Steam Client restart." Checking in on the Discord, this did seem to go live shortly after, and reports started to slow.