Update causes "400 Bad request"

Hello everybody!

I tried to get the latest branch of FLTK-1.1 entering the following:

$ svn co http://svn.easysw.com/public/fltk/fltk/branches/branch-1.1 fltk-1.1

This worked fine. But whe I want to update the directory, I get the
following:

$ cd fltk-1.1
$ svn up
svn: RA layer request failed
svn: REPORT request failed on /public/fltk/fltk/branches/branch-1.1
svn: REPORT of /public/fltk/fltk/branches/branch-1.1: 400 Bad Request

What could this be?

Thanks a lot,
Florian

---
This is the output of "svn --version":
svn, version 0.17.1 (dev build)
   compiled Mar 17 2003, 18:29:27
Copyright (C) 2000-2003 CollabNet.
Subversion is open source software, see http://subversion.tigris.org/
The following repository access (RA) modules are available:
* ra_dav : Module for accessing a repository via WebDAV (DeltaV) protocol.
  - handles 'http' schema
  - handles 'https' schema
* ra_local : Module for accessing a repository on local disk.
  - handles 'file' schema
* ra_svn : Module for accessing a repository using the svn network protocol.
  - handles 'svn' schema
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