Problem with biblatex and footnotes

I'm currently writing a research paper and want to manage my bibliography with biblatex. Everything is working fine except a minor annoyance:

Whenever I use the \footfullcite[pagenumber]{key} command there is no space between the full citation and the page number in the postnote.

I uploaded a minimal example here

Is there any way to solve this?

EDIT BY LOCKSTEP: Here's a boiled-down example that still shows the issue:

\documentclass{article}

\usepackage[style=authortitle]{biblatex}

\usepackage{filecontents}

\begin{filecontents}{\jobname.bib}
@BOOK{test,
title = {The Infamous Test},
publisher = {Testington Test},
year = {2007},
author = {John Doe},
}
\end{filecontents}

\begin{document}

\null\vfill% just for the example

Postnote spacing/punctuation doesn't work for \verb|\footfullcite|,\footfullcite[1-10]{test}
although everything is correct for \verb|\footcite|.\footcite[1-10]{test}

\printbibliography

\end{document}

-
Welcome to TeX.sx!. Rather than a link to a ZIP file, it's preferred that the minimal example is spelled out in the question. – egreg Nov 4 '12 at 15:23
Okay, thanks for the info! – Timm Nov 4 '12 at 15:26
Can you tell more about your setting? What version of biblatex are you using? – egreg Nov 4 '12 at 15:48
I'm using MiKTeX 2.9 and the bundled biber backend in the newest version (Version: 4689, Date: 11/2/2012). – Timm Nov 4 '12 at 16:02
It's related to \finentry. At some point after 1.7 \blx@initunit was uncommented in the definition of \blx@finentry@usedrv. Not sure why. Using \protected\def\blx@finentry@usedrv{\unspace} should fix the issue. – Audrey Nov 4 '12 at 16:20

The missing postnote delimiter is due to a bug in the \finentry definition for \usedriver. For now add the following to your preamble:
\makeatletter