k3b cannot create bootable iso-image

Binary package hint: k3b

Version 1.68.0 of k3b cannot create bootable iso-image. If i try to create a non-bootable iso-image, all is fine.
But trying create bootable iso-image, always fails. The error-message is always the same= "cannot determine
size of resulting image file".
The output of error-message says:
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Devices
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HL-DT-ST DVDRAM GH22NS40 NL01 (/dev/sr0, CD-R, CD-RW, CD-Rom, DVD-Rom, DVD-R, DVD-RW, DVD-R doppelschichtig, DVD+R, DVD+RW, DVD+R doppelschichtig) [DVD-Rom, DVD-R Sequentiell, Zweischichtige DVD-R Sequentiell, Zweischicht-DVD-R Sprung, DVD-Ram, DVD-RW Eingeschränktes Überbrennen, DVD-RW Sequentiell, DVD+RW, DVD+R, Zweischichtige DVD+R, CD-Rom, CD-R, CD-RW] [SAO, TAO, RAW, SAO/R96P, SAO/R96R, RAW/R96R, Eingeschränktes Überschreiben, Sprung zwischen DVD-Schichten] [%7]

K3b::IsoImager
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mkisofs print size result: 0 (0 bytes)

System
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K3b Version: 1.68.0
KDE Version: 4.3.2 (KDE 4.3.2)
QT Version: 4.5.2
Kernel: 2.6.31-21-generic

Used versions
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mkisofs: 1.1.9

mkisofs
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/usr/bin/genisoimage: No such file or directory. Invalid node - '/tmp/kde-hagen/k3bUT9116.tmp'.

mkisofs calculate size command:
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/usr/bin/genisoimage -gui -graft-points -print-size -quiet -volid FF7 -volset -appid K3B THE CD KREATOR (C) 1998-2007 SEBASTIAN TRUEG -publisher -preparer -sysid LINUX -volset-size 1 -volset-seqno 1 -sort /tmp/kde-hagen/k3buU9116.tmp -rational-rock -hide-list /tmp/kde-hagen/k3bZc9116.tmp -no-cache-inodes -udf -full-iso9660-filenames -iso-level 3 -path-list /tmp/kde-hagen/k3bNZ9116.tmp -eltorito-boot boot/ff7.img -eltorito-catalog boot/boot.catalog
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

k3b version 1.0.5 with Ubuntu 9.04 Jaunty works, k3b version 1.91.0 with Ubuntu 10.04 Lucid works too.
When i install version 1.0.5 in Ubuntu 9.10 Karmic, it works too. But i am not sure, if this is reliable, because
of the large number of dependencies.

Thanks in advance
Hagen

ProblemType: Bug
Architecture: i386
Date: Tue May 11 14:18:18 2010
DistroRelease: Ubuntu 9.10
NonfreeKernelModules: nvidia
Package: k3b 1.68.0~alpha3-0ubuntu1
ProcEnviron:
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-21.59-generic
SourcePackage: k3b
Uname: Linux 2.6.31-21-generic i686