Hello TofuQueen,
I am really sorry for this problem.
I know the problem that it's because it has ' on the question,
The javascript got cut because of the (') character.
so it doesnt only happen to from the bottom of one's heart, it only happens on any other answer which has '.
I will get it fixed on the end of November new release update.
Once again, I am really sorry for this problem, the solution for this is to stay away from reverse question for a while.
In the next release you can include Reverse question into the full random interval. so its not only Kanji & Vocabulary anymore (Kanji, Reverse, and Vocabulary)
So there will be more opportunity to practice on the reverse question after the update.
I know it's frustrating, but please be patient, I am working so hard on it. I will make it better! =D
Thank You,
JCJP Admin