If you are developing with the "org.eclipse.ui.workbench"
plug-in from CVS Head, chances are that you'll need to get an updated version
of two Equinox plugins:
(CVS: under "/head/" in ":pserver:anonymous@xxxxxxxxxxxxxxx:/cvsroot/eclipse")
(CVS: under "/head/org.eclipse.equinox/compendum/bundles/"
(The next I-build should contain updated
versions of those bundles.)