New TX math font symbol: skew underbrace with package newtxmath

Question

I found that the New TX math font newtxmath could not displace underbrace, see: latest Texlive 2012

The correct underbrace with default CM font:

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It's weird that it works well when I test it with a simple tex file.

  \documentclass[12pt]{book}
  \usepackage{amssymb}
  \usepackage{amsmath}
  \usepackage[T1]{fontenc}
  \usepackage{newtxtext, newtxmath}  % new TX times

  \begin{document}


  \begin{eqnarray}
  \frac{\sin^{2}\vartheta}{\Theta_{lm}(\vartheta)}\left(\frac{\partial^{2}}{\partial\vartheta^{2}}+\frac{\cos\vartheta}{\sin\vartheta}\frac{\partial}{\partial\vartheta}\right)\Theta_{lm}(\vartheta)+\sin^{2}(\vartheta)(l(l+1)) =\underbrace{-\frac{1}{\Phi_{m}(\varphi)}\frac{\partial^{2}}{\partial\varphi^{2}}\Phi_{m}(\varphi)}_{blabla} \\
  P_l (x)\equiv\frac {1}{2^l}\sum_{k=0}^{\lfloor l/2\rfloor} (-1)^k \frac{(2l-2k)!}{k!(l-k)!(l-2k)!} x^{l-2k}\\
  \iint_\Omega \frac{x^2+1}{2y}dxdy = 0
  \end{eqnarray}

  \end{document}

But it won't work with these packages used for my report:

 \usepackage{amssymb}
 \usepackage{amsmath}
 \usepackage{graphicx}
 \usepackage[table]{xcolor}
 \usepackage{enumerate}     % numbered items
 \usepackage{color}
 \usepackage{booktabs}    
 \usepackage{threeparttable}
 \usepackage{multirow}
 \usepackage[UKenglish]{babel}  % ngerman: "a "s "o "u
 \usepackage{subfigure}
 \usepackage[colorlinks]{hyperref}  % ref
 \usepackage{natbib}                % bibtex
 \usepackage{cases}
 \usepackage{algorithm}
 \usepackage{algpseudocode} 
 \usepackage{wallpaper}

 % | * * * * * * * * * * * * * * * * * * * * |
 % |        fonts with math support          |
 % | * * * * * * * * * * * * * * * * * * * * |

 \usepackage[T1]{fontenc}
 \usepackage{newtxtext, newtxmath}  % new TX times

 \usepackage{esint}     % Alternate integrals signs
 \usepackage{ngerman}  % after package mathdesign !

The rest packages and setting are for page layout, margin, etc.

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I am sure newtxmath conflicts with some certain packages, How to figure this out?

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Partial solution: Putting esint before newtxmath will eliminate this issue, but it produces the unchanged \iint symbol:

Answer 1

Load the redefinition from package esint after newtxmath with another name for the Symbol font because both packages load it with the same name largesymbolsA:

 \documentclass[12pt]{book}
  \usepackage{amssymb}
  \usepackage{amsmath}
  \usepackage[T1]{fontenc}
  \usepackage{esint,newtxtext, newtxmath}  % new TX times
\makeatletter
\DeclareSymbolFont{largesymbolsB}{U}{esint}{m}{n}% esint uses largesymbolsA
\re@DeclareMathSymbol{\intop}{\mathop}{largesymbolsB}{'001}
        \def\int{\intop\nolimits}
\re@DeclareMathSymbol{\iintop}{\mathop}{largesymbolsB}{'003}
        \def\iint{\iintop\nolimits}
\re@DeclareMathSymbol{\iiintop}{\mathop}{largesymbolsB}{'005}
        \def\iiint{\iiintop\nolimits}
\re@DeclareMathSymbol{\iiiintop}{\mathop}{largesymbolsB}{'007}
        \def\iiiint{\iiiintop\nolimits}
\makeatother
 \begin{document}
  \begin{eqnarray}
  \int \iint \iiint 
  \frac{\sin^{2}\vartheta}{\Theta_{lm}(\vartheta)}\left(\frac{\partial^{2}}{\partial\vartheta^{2}}+\frac{\cos\vartheta}{\sin\vartheta}\frac{\partial}{\partial\vartheta}\right)\Theta_{lm}(\vartheta)+\sin^{2}(\vartheta)(l(l+1)) =\underbrace{-\frac{1}{\Phi_{m}(\varphi)}\frac{\partial^{2}}{\partial\varphi^{2}}\Phi_{m}(\varphi)}_{blabla} \\
  P_l (x)\equiv\frac {1}{2^l}\sum_{k=0}^{\lfloor l/2\rfloor} (-1)^k \frac{(2l-2k)!}{k!(l-k)!(l-2k)!} x^{l-2k}
  \end{eqnarray}
\end{document}

Answer 2

I just figured out this issue: {newtxmath} is not compatible with the package {esint}!

When using {esint} to display neat \iint integral symbol, it must be put after the package of math font, but in this case, it produced wrong underbrace symbol.