Public bug reported:
When using package empheq the equation numbers are by default on the on
the right side of the equation. However, if the color package is loaded,
the number goes to the left side of the equation. This happens only with
empheq equations, the other (amsmath) equation numbers are still on the
right. It is impossible (as far as I tried) to get the empheq equation
numbers to the right side of the equation when color package is used.
The code to verify this is given below, just try commenting the color
package inclusion out. This is quite nasty, as LyX includes always the
color package... Also using colored backgrounds for equations with
empheq seems to be impossible, if you want right-sided equation numbers.
\documentclass{report}
\usepackage{amsmath}
\usepackage{empheq}
\usepackage{color}
\begin{document}
\begin{empheq}{equation}
E=mc^2
\end{empheq}
\begin{equation}
E=mc^2
\end{equation}
\end{document}
** Affects: texlive-extra (Ubuntu)
Importance: Undecided
Status: New
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empheq behaviour changes when loading "color" package
https://bugs.launchpad.net/bugs/259521
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