Twice, I’ve ended up in a buggy state where the right ramp is always lit as if you were doing a super skill shot (inserts continually do a chase animation). I think the bug is just limited to the insert effects, because it doesn’t seem to award anything if you hit the shot.
I believe both times it happened by combining Ninja MB and Katanarama. Tonight, the inserts continued doing this on subsequently played games. Eventually I turned off the machine and it went away.
(The previous time this happened to me, I didn’t play another game afterwards, so I’m not sure if it continued to happen on subsequent games)