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Thanks for your reply,
I'll give it another try to show a MWE;

\documentclass[12pt,a4paper,twoside,headsepline,footsepline]{scrbook}
\usepackage[english]{babel}
\usepackage[latin1]{inputenc}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage[pdftex]{graphicx}
\usepackage ...

Hello,
I have problems using longtable with koma scrbook. Some tables look fine while on some pages images are pushed outside the paper. I have a lot of image floats on these pages. I have also defined in the preamle;

%%%%%%%%%%%%%%%% Customization
\setlength{\textwidth} {16cm} % Textbreite ...