"Could not determine size of resulting image" while burning data

It used to work until a few months ago.

From the log:

Devices
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hp DVD-RAM GHA3N RH07 (/dev/sr0, CD-R, CD-RW, CD-ROM, DVD-ROM, DVD-R, DVD-RW, DVD-R DL, DVD+R, DVD+RW, DVD+R DL) [DVD-ROM, DVD-R Sequential, DVD-R Dual Layer Sequential, DVD-R Dual Layer Jump, DVD-RAM, DVD-RW Restricted Overwrite, DVD-RW Sequential, DVD+RW, DVD+R, DVD+R Dual Layer, CD-ROM, CD-R, CD-RW] [SAO, TAO, RAW, SAO/R96P, SAO/R96R, RAW/R16, RAW/R96P, RAW/R96R, Restricted Overwrite, Layer Jump] [%7]

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

System
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K3b Version: 2.0.2
KDE Version: 4.13.3
QT Version: 4.8.6
Kernel: 3.13.0-44-lowlatency

Used versions
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mkisofs: 1.1.11

mkisofs
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/usr/bin/genisoimage: No such file or directory. Invalid node - '/home/enzo/Desktop/Work/Musica/Uno/05-Rondò in do (archi).mp3'.

mkisofs calculate size command:
-----------------------
/usr/bin/genisoimage -gui -graft-points -print-size -quiet -volid Uno -volset Vincenzo Romano -appid K3B -publisher Vincenzo Romano -preparer Vincenzo Romano -sysid LINUX -volset-size 1 -volset-seqno 1 -sort /tmp/kde-enzo/k3boB2574.tmp -rational-rock -hide-list /tmp/kde-enzo/k3bjk2574.tmp -joliet -joliet-long -hide-joliet-list /tmp/kde-enzo/k3bEt2574.tmp -no-cache-inodes -full-iso9660-filenames -iso-level 3 -path-list /tmp/kde-enzo/k3bRE2574.tmp

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: k3b 2.0.2-7ubuntu1
ProcVersionSignature: Ubuntu 3.13.0-44.73-lowlatency 3.13.11-ckt12
Uname: Linux 3.13.0-44-lowlatency x86_64
ApportVersion: 2.14.1-0ubuntu3.6
Architecture: amd64
CurrentDesktop: KDE
Date: Sat Jan 17 11:07:31 2015
InstallationDate: Installed on 2015-01-12 (4 days ago)
InstallationMedia: Kubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
SourcePackage: k3b
UpgradeStatus: No upgrade log present (probably fresh install)