I just noticed this thread...one thing to keep in mind is that effects can be broken for one ride and 'fixed' for the next one immediately after. I've seen that happen before.
I'm no electronics expert, but just wanted to mention I've seen that happen several times. There could be issues like resetting timing, sensors on the track that get interrupted briefly, etc. but those are just guesses.
Having said that I saw earlier where someone said a thread like this is useless, and though those posts are a few months old, I have to say something anyway.
I disagree. If we start seeing a pattern, like 5 or 10 people posting that the same effect is not working, that can be a push for 2 reasons:
1.) Universal may read these posts and decide to investigate
2.) If it is a major issue, the next time we go to the parks, we can confirm the issue THEN contact guest services about it while we're at the park.
Having individual experiences where an effect isn't working, IMO isn't enough to complain to guest services about, because as I said, its possible it was just temporary....but when things are broken on several visits, a group reporting on that is a good thing.