I analyzed the problem and found out, that it does not seem to be a
problem with the images I try to open.

The problem seems to be a complex SVG file that got visited when I
browse to the destination directory of the image.

I checked the debugger output of gdb and I saw, that nautilus start a
new thread whenever I visit the directory with this SVG file. But
because this SVG file is really complex, this thread doesn't terminate
in an apropriate time. When I open another image without this thread to
be terminated, nautilus hangs...

(Perhaps, because it waits for a lock to be released by the thread that
creates the SVG preview)

Unfortunately I can't disclose this SVG file by now. But it is
apparently very complex - Inkscape needs a lot of memory and time to
render it. So perhaps the SVG thumbnailing mechanism of nautilus has to
be prevented to thumbnail complex images...

-- 
Nautilus hangs when clicking on preview images
https://bugs.launchpad.net/bugs/391757
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