Get Steam working again in less than 1 minute.
The 1500335472 Steam Microsoft Windows client package that was built on July 17, 2017, is causing a blank screen in the Store, and severe lag throughout the client (Library, Community, etc.).
Here's how you can fix that issue:
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Click on the Steam menu and click on Settings.
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Click on Web Browser and click on DELETE WEB BROWSER CACHE. Confirm by clicking on OK.