gnome-mount does not mount luks encrypted usb-drive

Binary package hint: gnome-mount

I'm using a LUKS encrypted ext2 partitition on an usb stick to store some data.

I expect following:
After sticking in, gnome-mount opens a dialog (like [1]) where it asks the passphrase, after that it mounts the luksOpened cleartext-mapper.

What happens:
nothing visuable.
In /dev/disk/by-uuid there is a symlink created to the LUKS partition on my stick.
gvm.log shows, that gnome-volume-manager recognizes an encrypted volume, but nothing more happens.

How I got some maybe useful data to debug:
Followed instructions in [2], gvm.log, udev.log, lshal.txt, dmesg.txt and devices.txt will be there as attachements.

id:
uid=1000(thorsten) gid=1000(thorsten) Gruppen=4(adm),20(dialout),24(cdrom),25(floppy),29(audio),30(dip),44(video),46(plugdev),108(lpadmin),113(admin),1000(thorsten),1001(scard),1003(vboxusers)

id haldaemon:
uid=110(haldaemon) gid=122(haldaemon) Gruppen=122(haldaemon)

uname -a:
Linux molybdaen 2.6.24-8-generic #1 SMP Thu Feb 14 20:13:27 UTC 2008 x86_64 GNU/Linux

/etc/lsb-release:
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=8.04
DISTRIB_CODENAME=hardy
DISTRIB_DESCRIPTION="Ubuntu hardy (development branch)"

gnome-mount is version 0.7-2ubuntu1.

[1] http://launchpadlibrarian.net/7346541/Screenshot-Unlock%20Encrypted%20Data.png
[2] https://wiki.ubuntu.com/DebuggingRemovableDevices