Nina, you might have solved your problem in the meantime. If not, just one thought: What happens, if you take out the Bibliography at the end of you document and run it again? If a reference is the offending part, it should run. Are you incidently using koma-script and two column page style? I have often problems with it, but do get a latex-log output of this kind pdftex error \pdfendlink ended up in different nesting level than \pd
The error is not easy to find, have a look at: http://ftp.tug.org/mail-archives/pdftex/2002-February/002216.html and read the remedy below latex log: fstartlink. <to be read again> \endgroup \...@typeset@protect l.3087 remedy: add 'draft' option to hyperref: \usepackage[draft]{hyperref} recompile document >pdf output citation whose latter half begins the page where pdflatex aborted rearrange text to avoid linebrake remove draft option
