Drag and Drop via gnome-panel broken

[error401]

Binary package hint: gnome-panel

in the previous Version of Ubuntu it was possible to drag a file from file-roller onto the gnome-panel window list to bring up that window (most cases nautilus for me) and finally drop it in there. The same goes for dragging files from one nautilus window to another. This behaviour seems to be broken after updating the system from 10.10 to 11.04 (I'm using the classic gnome-desktop).

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: file-roller 2.32.2-0ubuntu0.1
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic x86_64
NonfreeKernelModules: nvidia
Architecture: amd64
CheckboxSubmission: df98bb981aa390e159e4d367ebadcae1
CheckboxSystem: daed2f3d6643b4a84b4520a2427f8c2b
Date: Wed May 25 23:46:44 2011
ExecutablePath: /usr/bin/file-roller
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release amd64 (20091027)
ProcEnviron:
 SHELL=/bin/bash
 PATH=(custom, user)
 LANG=de_DE.UTF-8
 LANGUAGE=de_DE:en
SourcePackage: file-roller
UpgradeStatus: Upgraded to natty on 2011-05-21 (4 days ago)