Aconteceu comigo hj tambem. Achei a solução no site do steam.
https://support.steampowered.com/kb_article.php?ref=4100-WEAK-4375
Delete os arquivos ClientRegistry.blob, Steam.dll, SteamUI.dll,
Na pasta do Steam.
Ozzy Osbourne - Gets me through
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Cradle Of Filth - Nymphetamine
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Cradle Of Filth - Her Ghost In The Fog
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Lamb of God - Ruin
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Amon Amarth - Guardians of Asgaard
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:fun: