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Most of the results I get are you should re-start Steam and/or your computer. That seems obvious. Others are un-installing and re-installing Steam entirely. These solutions are obviously retarded and probably only work for about 10% of the people experiencing this problem. Good luck.
I think this an appropriate time to post my latest Rage comic.

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What I find to be even worse is when they go "Oh nvm I fixed it

yey!"
Then Id need that nervous rageface guy that goes "y u no give us the solution?!"