The fix for me was to mount the NFS volume 'nolock' in /etc/fstab, e.g:

LibreOffice fails to open files in NFS volume:
192.168.1.1:/home/fernan    /home/fernan/nfs-mount/    nfs    noexec,nosuid,bg  
  0    1

LibreOffice now successfully reads/writes files from/to NFS volume:
192.168.1.1:/home/fernan    /home/fernan/nfs-mount/    nfs    
noexec,nosuid,nolock,bg    0    1

I can't confirm, however, the workaround proposed by htgoebel. Neither
commenting out the following (in /usr/lib/libreoffice/program/soffice):

# file locking now enabled by default
SAL_ENABLE_FILE_LOCKING=1
export SAL_ENABLE_FILE_LOCKING

Nor setting SAL_ENABLE_FILE_LOCKING=0

Nor changing the locking configuration in /etc/libreoffice/soffice.sh to
FILE_LOCKING=no worked

This is now on Ubuntu 12.04 LTS
My NFS server (FreeBSD) remains at 6.4 (RELENG_6_4) as reported previously.

Hope this helps more people.

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https://bugs.launchpad.net/bugs/577038

Title:
  [Upstream] Hard lock in opening files from a remote NFS volume

Status in LibreOffice Productivity Suite:
  Confirmed
Status in LibreOffice:
  Confirmed
Status in The OpenOffice.org Suite:
  New
Status in “libreoffice” package in Ubuntu:
  Confirmed
Status in “openoffice.org” package in Ubuntu:
  Won't Fix

Bug description:
  Binary package hint: openoffice.org

  I recently updated to Lucid, and noticed that Openoffice would lock
  with opening certain files. First I thought the problem was a corrupt
  file, now I can reproducibly hard lock OO.org when trying to open ANY
  file (.xls, .doc, .odt) that is present in a remote NFS volume
  (locally mounted).

  Any file on the local hard disk can be opened without problems.
  Any file on the mounted NFS directory causes a hard lock, requiring a 
force-quit.

  Other applications don't show this behaviour (e.g. gedit, command line
  programs).

  Filesystem            Size  Used Avail Use% Mounted on
  /dev/md0               70G   17G   50G  26% /
  192.168.10.72:/home/fernan    243G  182G   42G  82% /home/fernan/gama-remote

  ProblemType: Bug
  DistroRelease: Ubuntu 10.04
  Package: openoffice.org 1:3.2.0-7ubuntu4
  ProcVersionSignature: Ubuntu 2.6.32-22.33-generic 2.6.32.11+drm33.2
  Uname: Linux 2.6.32-22-generic i686
  NonfreeKernelModules: nvidia
  Architecture: i386
  Date: Fri May  7 11:48:21 2010
  EcryptfsInUse: Yes
  ProcEnviron:
   LANG=en_US.utf8
   SHELL=/bin/bash
  SourcePackage: openoffice.org

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