Hearthstone - Tooltip issue
This is caused by alt-tabbing and is a known bug that Blizzard are working on. For now it's best to avoid alt tabbing if possible.
Also in the future please try and report bugs on the bug report forums found here(just makes it easier to have all bugs in the one forum): http://us.battle.net/hearthstone/en/forum/10591462/
Twitter: @Narull | ANZ Diablo III MVP
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There not spelling mistakes, Im speaking 'Ye Old English'
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