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A year ago I wrote my thesis and I compiled it using LuaLaTeX (I need very much memory because I have a lot of pgfplots graphs) and it works pretty good. Today I recompile it and some formulas mess up.

The problem is using symbols with a variable height like square roots and brackets. Below there is a MWE showing the problem and then the images of the result compiling with LuaLaTeX or pdfLaTeX.

MWE

\documentclass{article}

\begin{document}

\begin{equation} 
\hbar\omega_{\pm} = \frac{\hbar q}{2} \sqrt{ \frac{\hbar^2q^2}{m^2} + 2c_1^2 + 2c_2^2 \pm2\sqrt{ {c_1}^4 + {c_2}^4 + 2{c_1}^2{c_2}^2\left(\frac{2{g_{12}}^2}{g_{11}g_{22}}-1\right) } }
\end{equation}

\begin{equation} 
\hbar\omega_{\pm} = \frac{\hbar q}{2} \left[ \frac{\hbar^2q^2}{m^2} + 2c_1^2 + 2c_2^2 \pm2\sqrt{ {c_1}^4 + {c_2}^4 + 2{c_1}^2{c_2}^2\left(\frac{2{g_{12}}^2}{g_{11}g_{22}}-1\right) } \right]^{1/2}
\end{equation}

\end{document}

LuaLaTeX

enter image description here

pdfLaTeX

enter image description here

The second equation has the same problem with both compilators: the brackets are not high enough compared with the square root. Checking more carefully I see that this problem was present also a year ago. The second problem is instead new and involves only LuaLaTeX: I can't nest two square root without obtaining that strange black area....

But the problem disappears if I have no fractions:

enter image description here

It seems like there is a maximum height of the symbols that can't be overcame

closed as off-topic by Andrew Swann, user31729, Guido, Henri Menke, Paul Gaborit Dec 29 '14 at 10:12

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  • What version of LuaTeX do you have? You find the information in the first line of the log file – egreg Oct 28 '13 at 14:10
  • @egreg Version beta-0.70.2-2012062323 (TeX Live 2012/Debian) (format=lualatex 2013.6.19) – Red Oct 28 '13 at 14:12
  • I'm afraid there's a bug with the square root, in that version; with 0.76 I get a good result in the first equation, while the delimiters are too low in the second. – egreg Oct 28 '13 at 14:14
  • @egreg Do you think the height of the delimiters is a bug too? Because it is wrong also with pdflatex – Red Oct 28 '13 at 14:17
  • 4
    This question appears to be off-topic because it is about a bug now fixed in the current distributions – Andrew Swann Dec 29 '14 at 9:23

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