OSX Maverick Mouse Issue

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Bake a Bagel



I've installed OSX Maverick and the game seems to be running fine except that left-clicking interfaces with the mouse, like to buy items from the shop or switch interface shop tabs, seems to be off-position and it takes double-clicks to register what would normally be a single-click on the interface.

When I tab out and load another program, then go back to the LoL window, everything works fine as normal.

Windowed mode
OSX Mavericks 10.9
Intel Core 2 Duo, 2GHz
nVidia GeForce 9400 256MB