So I just played a game where all the minion auto attacks were replaced by flying "exhaust" icons

It happens intermittently, most often when you alt-tab during the loading screen, particularly the first few seconds before the champion banners show up.

This sounds like a wonderful bug. I can only imagine that pointers got messed up...

omg thats funny. Same thing happned to me but instead of exhaust icons it was blue missing bolts. What happened if i was to guess is a employee got mixed up and wrote the wrong file pathway

I have had a similar bug where whenever the red turret shot hit something, there would be a instead of the proper particle.