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Fixed a crash if PeTI avatars could not be retrieved. Fixed some items in PeTI not maintaining their portalability state when expanding the chamber boundaries. Fixed being able to copy 'uncopyable' items in the PeTI leading to invalid/broken levels. Fixed the fizzler not playing the retract animation when turned off in new PeTI maps. Fixed a crash in the PeTI if you placed a light strip above a laser catcher on the floor and linked it to a fizzler. Fixed the game starting in the top left corner of the screen on Linux. Fixed the intro videos for acts 2 and 3 not playing on Linux. Fixed the credits being corrupted on Linux. Fixed a crash that could occur in some community test chambers using BEEMod on Linux. Fixed a crash on startup that could happen on Linux. Removed the "Trading Coming Soon" button. Added the ability for workshop levels to pack particles into their map with a particles/map_manifest.txt Improved client-side prediction for coop play. The portalgun is now correctly affected by dynamic lights (projected textures) in the scene.
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Button text contrast and padding has been improved when using a controller. Players can now be invited to play co-op on controller. Improved resolution of player avatars throughout the game. Improved advanced video settings descriptions. Improved compile time for Perpetual Training Initiative puzzles.
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Implemented a Vulkan render backend (currently accessible through the -vulkan command line parameter). An update has been released for Portal 2.
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