I'm using latest version EVGA Precision x16 and it bugs on Battle.net app. Windoes 8.1 64x
It makes Bnet launcher crash, and if you manage to join the game (Heroes of the Storm) before that happens, it doesn't show the mouse cursor.
There are more people reporting this problem in bnet forums. But well I guess this forum is the right place to do it.
This happens with OSD on or off.
And it doesn't help to add the bnet executables on the Precision server list