"show-keys=true" in eps crashes compilation

[danleich]

As I posted on tex.stackexchange I would like to see the label keys I replaced in .eps figures using the \replacecmpd command. If I use show-keys=true it crashes the compilation, if I user show-keys=ref it shows the newly defined keys in the figure, not the referenced ones actually. Also I have to use \replacecmpd+for earlier defined labels, otherwise it gives the error: "Bad space factor (0)"
I saw that for newly defined labels the key is being put into the margin, maybe that is part of the problem? Just a guess from my side.

The eps is still in my dropbox, is there a way to put it here directly? (I am new to github and did manage to create a repository with tex and eps file, but have no idea how to link it here :D )

the code is as follows:

\documentclass[english,
10pt,
]{scrreprt}

\usepackage{chemmacros}
\usechemmodule{
	spectroscopy,
	scheme,
	nomenclature,
	mechanisms,
	isotopes,
}

\setchemnum{
	replace-tag={X},%X<#> used as template tag, better visualization in chemdraw file than TMP<#>
	show-keys=ref,
}

\usepackage[runs=2]{auto-pst-pdf}

\begin{document}

Here the numbers are defined: \cmpd{Garner_02} and \cmpd{Garner_04}

\begin{scheme}[htb]
	\centering
	\replacecmpd{Boc-ser-OMe}
	\replacecmpd+{Garner_02}
	\replacecmpd+{Garner_04}
	\replacecmpd{Garner_22}
	\includegraphics[scale=0.7]{garner_rxn}
	\caption{Synthesis of Garner's aldehyde~\cmpd+{Garner_04} and the corresponding Weinrebamide~\cmpd+{Garner_22}.}
\end{scheme}

Here they are referenced: \cmpd{Garner_02} and \cmpd{Garner_04}

\end{document}