I am curious why the ability to click on up and down arrows to give points is no longer available in Quizzes? Now I have to use two hands to grade instead of just using my mouse or track pad. Not user-friendly. Also, the grade does not accumulate at the bottom any longer- it continues to say "0" even after you have given points. In the past, it always updated as you graded each question.
Are you talking about when you're grading a quiz in SpeedGrader? The second issue - the grade not updating as you go - is either a change in functionality as of the October 28th release, or a bug (depending on who you ask). A colleague of mine started a feature idea to return this functionality (Speedgrader Final Score Automatic Update) and there is some discussion of the undesirable changes that were introduced in the Canvas Production Release Notes (2017-10-28).