Dota 2 Update - September 15, 2015

[steam_news]

Fixed a bug that allowed coaches to spawn heroes.
Fixed an alt-tab issue on multiple monitor systems that would fail to confine the mouse upon resuming the game.
Fixed a cause of duplicated input execution.
Enabled additional logging in replays to assist us with diagnosing other input execution problems that may still exist.
Fixed a bug with playback of stereo effects on surround systems.
Fixed a bug where some particle systems on wards and buildings would not render when in fog of war.
Fixed a bug that prevented spectator chat from being disabled.

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