For some reason, whenever I try to remove a block, copy a block, or place a block (mouse buttons), it goes straight to the pause screen. If I press "Back to game", it closes and reopens the pause screen quickly (therefor just pressing any mouse buttons causes the game to pause). I'm on Linux Mint 9, and it shows no exceptions at all in terminal when I run it from terminal. Also, this only happens when I click and the window is focused. If the window isn't focused and I click it works normally.