$~/bin/latex2rtf -v
latex2rtf 2.3.8 r1240 (released June 16 2014)
$~/bin/latex2rtf test.tex
Segmentation fault (core dumped)
$ cat test.tex
\documentclass[11pt,a4paper]{article}
\usepackage[english]{babel}
\begin{document}
\begin{tabbing}
\hspace{2em}\=\hspace{10em}\=\hspace{10em}\=\hspace{5em}\=\\
\textbf{Name}
\>\>\>\>0
\+
\end{tabbing}%
\end{document}
and
(gdb) bt
#0 0x08053829 in TabbingNextCell ()
#1 0x08053a2d in TabbingWriteRow ()
#2 0x08053f6f in CmdTabbing ()
#3 0x0804bd7e in CallParamFunc ()
#4 0x0804cdaa in CmdBeginEnd ()
#5 0x0804bc7d in CallCommandFunc ()
#6 0x08069077 in TranslateCommand ()
#7 0x08067e7d in Convert ()
#8 0x08067b9f in ConvertString ()
#9 0x08059ecf in ConvertWholeDocument ()
#10 0x08059d5f in main ()
Sorry, latex2rtf doesn't (yet) support \hspace{2em} etc. in these places.
This example works:
\documentclass[11pt,a4paper]{article}
\usepackage[english]{babel}
\begin{document}
\begin{tabbing}
mm\=mmmmmmmmmm\=mmmmmmmmmm\=mmmmm\=\kill
\textbf{Name}
>>>>0
+
\end{tabbing}%
\end{document}