Show errors/answers

Hi! I found a problem when the students click on the "finish" button, they can't see which answers are correct or incorrect, although I can see it in my mailbox. 

Also, the option "show right answers after checking the exercise" is not working even though I customized my links one by one again, but the options don't seem to save. 

I wish there is a solution soon for this issue, I find it difficult to continue using this website, which is a great ally in my live lessons and to give as homework!

Thanks!