\documentclass[11pt,english]{article}
\usepackage{hyperref}
\begin{document}
This is the top of the page!
\vspace{18cm}
This is the bottom of the page! Blah blah blah blah \url{http://www.martinharrigan.ie}?
\end{document}
Then I get:
It looks like the header has become a link as well! With natbib links, the page number is also active. My quick fix is to avoid page breaks in the middle of links altogether by using \clubpenalty:
\documentclass[11pt,english]{article}
\usepackage{hyperref}
\begin{document}
This is the top of the page!!
\vspace{17cm}
This is the bottom of the page! Blah blah blah blah blah blah blah blah blah blah
blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah
blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah
blah blah blah blah blah blah blah blah blah blah \clubpenalty10000\url{http://www.martinharrigan.ie}?
\end{document}
And then all is well in the world again:
By the way, the hopeful-sounding 'breaklinks' option of the hyperref package doesn't fix the problem.
