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It seems that the problem only occurs on my computer and not on other computers. I've attached a screenshot of the example in the previous post.

The following example does work on my computer, although the text is not aligned nicely close to the figure:
\documentclass{book}

\usepackage[pdftex ...

Using the titlesec package, I want to remove the whitespace above the chapter heading. Using the code below the whitespace is removed, but there is a problem when using the wrapfig package. The area that is reserved for the wrapfig environment is copied to every paragraph. I.e. every paragraph has a ...