Unreliable copy/paste functionality in Eclipse after upgrading to 11.04

Binary package hint: eclipse

Copy/paste functionality using keyboard shortcuts in Eclipse became very unreliable after upgrading from xubuntu 10.10 to 11.04. No noticeable pattern: Could copy/paste the exact same way over and over and get hit-and-miss results. Using mouse menus for copy/paste appears to work fine. On failure, pasted contents are empty.

When copying using keyboard shortcut in eclipse, xfce4-settings-helper throws:
(xfce4-settings-helper:3137): Gtk-CRITICAL **: IA__gtk_clipboard_set_with_data: assertion `targets != NULL' failed

...this does not occur when copying from within eclipse's Edit menu, only with Ctrl+c.

A workaround is to disable (or kill) the xfce4-settings-helper process, at the expense of the services it provides. After this process is disabled, the copy/paste functionality is flawless.

May be related to:
http://lists.gnu.org/archive/html/emacs-devel/2011-05/msg00296.html

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: eclipse-platform 3.5.2-8ubuntu3
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic x86_64
NonfreeKernelModules: fglrx
Architecture: amd64
Date: Sat May 21 05:52:16 2011
ExecutablePath: /usr/lib/eclipse/eclipse
InstallationMedia: Xubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101008.1)
ProcEnviron:
 LANGUAGE=en_US:en
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: eclipse
UpgradeStatus: Upgraded to natty on 2011-04-29 (21 days ago)
xulrunner-versions: /usr/lib/xulrunner-1.9.2.17