MIddle mouse button alert

I really like the scroll grab feature in league. I know most people don't use it, but for me, using the minimap or pointing the mouse towards the edge of the screen seems to impractical. But recently, my middle mouse stopped working, and I don't know why! It's not a keybind issue or anything, it's just that I can't drag scroll anymore. Is there a fix other than reinstalling, because that seems like a pain in the ***. I hope you guys can help!