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Hearthstone mouse click not registering sometimes

Mouse clicks are not registering in Battlegrounds, mostly when choices are presented that that require mouse click for validation. An example that occurred for me 100% of the time is the final place&rating displayed at the end of the match, that normally required a mouse click to dismiss. Not amount of clicking and/or waiting helps. But sometimes it happened in similar circumstances, for example when required to select the hero at the start. In all cases the game is not freezed (animation on-mouse-over still react for example). Unfortunately there is no way to acknowledge/dismiss these situations with the keyboard in game.
The game works flawlessly otherwise.
Any idea how this problem could be fixed?