September 15, 2015 Patch

{{Patch layout
 * source = http://store.steampowered.com/news/18416/
 * source-title = Dota 2 Update - September 15th 2015
 * source2 = http://store.steampowered.com/news/18418/
 * source2-title = Dota 2 Update - September 15th 2015 - B
 * before = 2015-09-14
 * after = 2015-09-16
 * notes =
 * 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.

Update 2
}}
 * Fixed a bug that caused heroes to become unresponsive.
 * changes =