It was caused by a wrong reply link in the page that displays single posts. Fixed now.

On Thu, 06 Dec 2012 08:50:36 +0100, Sönke Ludwig wrote:

Looks like the URL was malformed, I'll try and see how this could happen. Thanks for posting it.

Am 05.12.2012 23:29, schrieb Dan:

On Wed, 05 Dec 2012 22:26:28 GMT, Dan wrote:

I received this the first time I tried to reply. You probably have this logged somewhere, but in
case it helps track down any issues.