We believe that your issue has been closed by the upload of
Version 0.26.5 of grml-live from Michael Prokop <mika@grml.org>.
The explanation is attached below

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Format: 1.8
Date: Tue, 18 Nov 2014 13:07:07 +0100
Source: grml-live
Binary: grml-live grml-live-db
Architecture: source all
Version: 0.26.5
Distribution: unstable
Urgency: medium
Maintainer: Michael Prokop <mika@grml.org>
Changed-By: Michael Prokop <mika@grml.org>
Description:
 grml-live  - build system for creating a Grml (based) Linux live system
 grml-live-db - log package build information of grml-live to database
Changes:
 grml-live (0.26.5) unstable; urgency=medium
 .
   * [b9012b6] Drop deprecated mtab.sh script from runlevel.conf
     [Closes: issue1321] Thanks to Christian Hofstaedtler for reporting
   * Software related changes:
     - [aab3330] add wodim to GRML_FULL [Closes: issue1324]
     - [f3ab027] replace wodim with xorriso [Closes: issue1233]
       Thanks to Alexander Wirt for pointing out that wodim is outdated
Checksums-Sha1:
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 34f86048b55fa6fdf4eb0c83d576d515e8717e24 469072 grml-live_0.26.5.tar.xz
 3d15ca23ca62d63f7cfcc4055950e01eecd3a79a 496140 grml-live_0.26.5_all.deb
 051973a04163a26f46cb86f77202c5ca7b6410bc 68582 grml-live-db_0.26.5_all.deb
Checksums-Sha256:
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 dadceba2e5863cd8b15dce5fc7e15c711da88b66246b3451966a17e046ccf511 496140 grml-live_0.26.5_all.deb
 9297cded153b419d14085a9afbc66fea157e5e44bfaefec934176c87d98a7827 68582 grml-live-db_0.26.5_all.deb
Files:
 bdea4e7e5dbb120e06220cdd8f81c59e 992 grml extra grml-live_0.26.5.dsc
 c79860fc25d11bfdb97e244c8dd38ddb 469072 grml extra grml-live_0.26.5.tar.xz
 58cebad3b84523d0a80e93bcec2a70ba 496140 grml extra grml-live_0.26.5_all.deb
 d338b60f5a7aff8d32d137b8c3cc8e99 68582 grml extra grml-live-db_0.26.5_all.deb

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We are switching back and forth between xorriso and genisoimage in our package selection. We 
should settle on one of them and make sure all our tools have support for it (e.g. grml-live-
remaster comes to my mind, actually being the cause for adding genisoimage to GRML_FULL 
recently).