Marked as Uninstalled in Steam

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FNG / Fresh Meat
Oct 31, 2014

I bought Killing Floor earlier this week, and I've been playing quite a bit over the last few days.
When I went to play it yesterday, it was marked as an uninstalled game in my Steam library --- even though I was playing the game a few hours before.

When looking around my computer, I found all the files were intact. I tried "Verifying the Cache", but Steam wouldn't allow that option cause the game didn't seem to be installed. So I immediately deleted the game files, downloaded it again, and it worked. (Actually, it didn't work right away... After the whole process of re-downloading the game; it looked installed in Steam, but the game wouldn't start up. I deleted killingfloor.ini, and then the game launched properly)

But it just happened again Today...
I logged on to Steam and it's marked as uninstalled.

Any help appreciated!

MacBook Air
11-inch, Mid 2011
Processor 1.6 GHz Intel Core i5
Memory 2 GB 1333 MHz DDR3
Graphics Intel HD Graphics 3000 288 MB
Software Mac OS X Lion 10.7.5