We have students who have figured out that an instructor checking the box for "Users must post before seeing replies" is completely useless. The students found a loophole: they just reply with something short (like a word or punctuation), go in and read other submissions, and then submit their "own" response that's just rehashing things other people said. This is double frustrating, because, unlike other things you can view in speedgrader, you can't see the older submissions/edits, so there's no way to say whether they are cheating or not with the edit functions.
This make setting up discussions difficult to recommend. Is there any way to stop this? Are others experiencing this?