I'm talking about Moodle 7.1...
We had a big problem the other day with students completing a timed quiz and finding none of their answers have been saved.
A bit of investigation showed that they had been completing ignoring the 'Next' button (there are 5 questions per page) and using the navigation 'bar' to move from question to question. As (iirc) this is a timed quiz, this appears as a horizontal line of pages rather than the usual block.
I was a bit surprised that doing this neither saved the page or produced the "you are leaving this page" popup if it wasn't going to.
I need to do a bit more investigation but any initial thoughts are appreciated.