We have just shipped an updated Steam Client to the Preview/Beta channel.
Steam Achievement Sets
A new way to organize, track, and complete a game’s achievements. Read more details in the announcement.
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Games can now organize and group achievements for base game and DLC content
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DLC achievements can be added via sets without breaking game completion
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Completed achievement sets remain completed when new sets are added
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Achievements and sets can be archived if they are seasonal or can no longer be achieved
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Updated Achievements page and achievement rollup displays

General
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Notifications settings layout has been changed to be easier to work with on all screen sizes
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Fixed multiple edge cases that could cause memory leaks in game streaming and controller code
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Multiple general stability improvements and fixes for rare crashes affecting small numbers of users
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Fixed an error displaying dates for users in British Columbia
Library
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Improved offline support for the activity feed and fixed cases where it could previously skip loading some events.
Linux
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The Steam client is now a 64bit application.
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The Steam client now runs inside a Steam Runtime container.
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This will help the Steam client provide a more consistent experience across multiple distributions. This is the same technology used by Steam games.
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Fixed a case where Steam updater UI would fail to show for some users.
Remote Play
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Added a “Display Style” setting to allow stretching and zooming when the stream is a different aspect ratio than the client display.
Steam Controller Firmware
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Fixed an issue where shutting down a controller while docked to the puck could cause it to turn back on
Accessibility
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Background art will appear on the home screen when High Contrast is enabled
