Are you clicking all the way thru?? If not it will not update..
With out a file it is impossible to say....
If you have used the "back plot" function and then updated..you would need to delete the previous back plot and re do it.. again without a file ..hard to say..
The "instant" back plot will update every time you update an operation.. The "hard" back plot will not..it is on it's own layer and is just like regular geometry..