Sign up ×
TeX - LaTeX Stack Exchange is a question and answer site for users of TeX, LaTeX, ConTeXt, and related typesetting systems. It's 100% free, no registration required.

I think I found a bug in LuaLaTeX. I use the current version from TeX Live 2012.

lualatex --version
This is LuaTeX, Version beta-0.70.2-2012052410 (TeX Live 2012)

When I compile the following document

$\displaystyle\sqrt{\sum_{k=1}^{n} x_k}$

it works fine with pdflatex; correct formula.

But with lualatex I get bad rendering.

So, where should I report this? And how can I get around it?

share|improve this question

closed as too localized by Aditya, Kurt, Werner, Jubobs, Guido Apr 5 '13 at 23:27

This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center.If this question can be reworded to fit the rules in the help center, please edit the question.

this looks quite similar to how-can-i-debug-this-problem-with-math-typesetting – cmhughes Aug 12 '12 at 21:46
The LuaTeX bug tracker can be found at – Torbjørn T. Aug 12 '12 at 21:55
This bug seems to be fixed upstream: Debian's version does exhibit the bug and has "pick from upstream luatex-svn: fix rendering of radicals with old fonts (Closes: #680015)" in its changelog. – cebewee Aug 13 '12 at 1:57
Can't reproduce in 0.71.0-2012080520 (rev 4356) – Martin Schröder Aug 13 '12 at 16:39
A solution was posted here:… – alfC Apr 5 '13 at 10:29

1 Answer 1

up vote 8 down vote accepted

There are several ways.

  1. The first is, as @Torbjørn T. mentions, the bug tracker at

  2. There is of course the mailing list, you can subscribe to at It might be easier to discuss the problem there first, and the developers of LuaTeX are members of the list

  3. There is, a q&a site where you can discuss the problem you are experiencing. Several regular members of are willing to put a bug on the tracker if you can't do it.

  4. If for some reason you can't at any circumstances make a public bug report, I am sure the authors of LuaTeX won't mind a private email. This has to be within reason, of course.

General rules apply to bug reports:

  1. Post what you experience and what you expect instead
  2. give a MWE, a minimal working example that shows the problem. Preferable it should work under plain LuaTeX, but ConTeXt or LaTeX might be OK, if the problem can't be reduced. The more dependencies (luaotfload for example), the more difficult it is to find the culprit.
  3. Use the newest version that is available (if possible). Always report the platform (Mac/Windows/Linux) and the version number (luatex --version) and distribution.
share|improve this answer

Not the answer you're looking for? Browse other questions tagged or ask your own question.