Kennen Ult invisible

My friends and I were playing the other night and we faced a Kennen. The problem was that when he ulted, no one on my team could see the ult. We'd take tons of damage and get stunned, but there were no visual indicators whatsoever. Normally, I'd repair my client and move on, but this was happening to every single person on my team. No one could see the ult.

I don't know what else to say except that it was a Karate Kennen skin that was being used, though I'm not sure if that really matters. Hope the problem can be found out.