The problem is the package a4wide. It is obsolete and actual LaTeX-packages won't take care of it. Have also a look at
http://www.ctan.org/tex-archive/info/l2tabu/english/l2tabuen.pdf
to read what is also obsolete.
Thanks Uwe.
The document you suggested contained a few other things that I weren't aware of which have caused me grief in the past. For those who haven't, I highly recommend reading it.
Ta, Paul
