Quote (kresh91 @ 28 Nov 2011 20:49)
Just restart steam, usually happens if you alt tab frequently. A lot of bad things happen when you alt tab in dota 2. Try restarting dota 2 or even steam. That should work.
fix for alttab
Alt+tab trouble fix set launch options in steam for DotA2 like
-window -w xxxx -h xxxx -noborder -console w= width h=height e.g. -w 1440 -h 900