The people over at ACE/TAO HQ have patched a minor issue that affects us (https://issues.jboss.org/browse/BLACKTIE-147) so I am upgrading the build to use this latest version.
It does mean that you will need to rebuild and reinstall ACE in your local repository if you aren't on a CentOS 5.4 64bit, CentOS 5.5 32bit or Visual C 9 32bit based development.
Tom