12.10.3 Can you answer these questions?

12.10.3.1 Fraction denominators being "eaten" inside QuestionObject using Mathematica online

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=319003

I am trying to code some practice problems for students using QuestionObject with plans to deploy it through Wolfram Cloud. The basic question code works fine in desktop Mathematica. 
... 
[mathematica-online] [cloud-deploy]
 

asked by Chris Kennedy https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=47356 Score of 1

12.10.3.2 How to implement precedence-aware automatic parenthesizing when typesetting

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=319008

Trying my custom operator,  op , to represent the cross product, how can I correct my code below so that parentheses are automatically shown when nested in order to ... 
[display] [precedence]
 

asked by Soon https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=78050 Score of 1

12.10.3.3 Is it possible to fix holes in a surface produced by ListContourPlot3D?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=319041

I have some numerical data which represents a probability distribution function over three-dimensional position, and which I would like to plot as a 3D contour plot. 
I have a recurrent issue, however, ... 
[plotting] [graphics3d] [contour]
 

asked by Emilio Pisanty https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=1000 Score of 1