Invisible Cursor!
I have been playing with same computer/Razer mouse for a long time now with no problems, but for some reason, today when I started a game of League (ARAM) my cursor was invisible! I could still click normally, just the cursor wouldn't show up. I would show up in the client before games, but once I got in game, it was gone.
I tried resetting LoL, repairing my client, updating my mouse driver, restarting my computer, but nothing worked. This is beyond frustrating...