I have a 2 TB drive that's dedicated for gaming purposes, so I'm able to have all my games downloaded on my machine. All of a sudden, about a dozen games in my library decided to become uninstalled, and now I have to go and re-download them if I have any inkling to play them. It was mostly a bunch of Valve games, but several others were rendered uninstalled too. The files are still on my computer, but Steam isn't recognizing them. I've restarted Steam and my computer to no avail.
Does anyone have solutions to this problem without actually spending the effort to re-download them? I haven't found any solution on the Internet that has worked for me.