Most of the fixes done by the patch are related to multiplayer, mostly stabilizing connections and tweaking damage numbers.
The patch notes include the following fixes and tweaks:
* Improved stability for Zombies, Multiplayer, and Dedicated Servers.
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Fixed server hitching when client is kicked for inactivity.
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Added server browser Filter for DLC.
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Quickmatch will prioritize servers running only the maps you own.
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Addressed various MP and Zombies exploits.
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Addition of the “Dolly Cam” editing mode in Theater.
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Improved reliability of Recent Game films saving properly.
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Connectivity improvements for Zombies.
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Added ability to remove Counter Spy-Plane effects with the Jammer.
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Players that put an enemy into Second Chance are now credited with a kill when the downed player is killed or takes the ‘coward’s way out’.
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Players will no longer receive any “hitmarkers” for shooting friendly equipment.
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Addressed an issue with switching classes while using a Chopper Gunner / Gunship.
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Disable player movement sounds when Ninja perk is equipped.
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Players can no longer “spawn tube” with the China Lake at the beginning of a match.
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Additional fine-tuning of audio levels for bomb plants/defuses.
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Headshot “ping” is now only audible if enemy dies.
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Limit the ability to re-roll supply drops using Hardline Pro to Care Packages only, no other killstreak drops.
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Addressed an issue where the incorrect perks would appear when spectating another player under certain circumstances.
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RC-XD adjustments.
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Addressed an issue with calling in Chopper Gunner / Gunship immediately after being shot down from a previous one.
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Various improvements to Multiplayer and Zombies leaderboards.