Grazie per la disponibilità.
\documentclass[footinclude,a4paper,headinclude]{scrbook}
\usepackage[italian]{babel}
\usepackage{classicthesis-ldpkg}
\usepackage[pdfspacing, subfig,eulerchapternumbers, eulermath, tocaligned, listsseparated]{classicthesis}
\usepackage{frontespizio}
\usepackage[italian]{babel}
\usepackage[latin1]{inputenc}
\usepackage{microtype}
\usepackage{amsmath,amssymb}
\usepackage{lipsum}
\usepackage{makeidx}
\usepackage{arsclassica}
\usepackage[tight,italian]{minitoc}
\usepackage{booktabs}\captionsetup
{skip=\medskipamount}
\makeindex
\begin{document}\dominitoc
\addcontentsline{toc}{chapter}{\numberline{}\contentsname}
\tableofcontents
\addcontentsline{toc}{chapter}{\numberline{}\listfigurename}
\listoffigures
\addcontentsline{toc}{chapter}{\numberline{}\listtablename}
\listoftables
\chapter{ciao} \index{ciao}
\minitoc\mtcskip
Ciao.
\begin{table}
\caption{I computer}
\label{tab:computer}
\centering
\begin{tabular}{lcr}
\toprule
Apple & Mac~OS~X & 10.5 \\
NeXT & NeXTSTEP & 3.3 \\
Be & BeOS & 5.0 \\
\bottomrule
\end{tabular}
\end{table}\lipsum
\begin{figure}
\centering
\includegraphics[height=%
0.15\textheight]{vento}
\caption{vento}
\label{fig:float}
\end{figure}\begin{figure}
\centering
\includegraphics[height=%
0.15\textheight]{prova}
\caption{Un lancio}
\label{fig:float}
\end{figure}\cleardoublepage
\manualmark
\markboth{\spacedlowsmallcaps{\indexname}}%
{\spacedlowsmallcaps{\indexname}}
\refstepcounter{dummy}
\pagestyle{scrheadings}
\addcontentsline{toc}{chapter}{\tocEntry{\indexname}}
\printindex
\end{document}
Ripulendo un po’ il codice, arrivo a questo esempio (quasi) minimo compilabile:
`\documentclass[a4paper]{scrbook}
\usepackage[italian]{babel}
\usepackage{classicthesis-ldpkg}
\usepackage[pdfspacing,listsseparated]{classicthesis}
\usepackage[latin1]{inputenc}
\usepackage{arsclassica}
\usepackage{booktabs}
\begin{document}
\tableofcontents
\listoffigures
\listoftables
\chapter{ciao}
Un po' di testo.
\begin{table}
\caption{I computer}
\label{tab:computer}
\centering
\begin{tabular}{lcr}
\toprule
Apple & Mac~OS~X & 10.5 \\
NeXT & NeXTSTEP & 3.3 \\
Be & BeOS & 5.0 \\
\bottomrule
\end{tabular}
\end{table}
\begin{figure}
\centering
\includegraphics[height=%
0.15\textheight]{image}
\caption{vento}
\label{fig:float}
\end{figure}
\begin{figure}
\centering
\includegraphics[height=%
0.15\textheight]{image}
\caption{Un lancio}
\label{fig:float2}
\end{figure}
\end{document}`
Se elimini la parte evidenziata in rosso, viene rispristinato il comportamento “standard”. Per un’introduzione a ClassicThesis, nella quale trovi spiegato a cosa serve listsseparated, ti rimando a questa guida: http://www.lorenzopantieri.net/LaTeX_files/ClassicThesis.pdf.
Ciao
Antonio