Dota 2 Update - September 14, 2015

[steam_news]

Fixed some cases where couriers would appear as an error model if a player selected a different courier after entering the game.
Fixed Manifold Paradox gravestones blocking neutral creep camps.
Adjusted juke paths and ward/blocking around radiant neutral camp SW of lower rune point.
Fixed Dire fountain ramp width.
Fixed an issue with lobby slots being assigned incorrectly.
Fixed an issue where mousewheel would stop working in some cases after exiting full preview mode.
Fixed a crash when using alt+tab on some configurations.
Fixed a case where parties could incorrectly enter ranked matchmaking.
Fixed portions of the Quit button not accepting clicks.
Fixed a crash launching workshop tools on Windows 7 without Service Pack 1.
Fixed some client crashes.

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