Ktorrent is unable to save temp files on a hard disk shared for samba

[Hicks]

I have a home network with some PC 's and Macs.
I would like to save the temporary data of ktorrent on a hard drive connected to my router, and shared by samba to resume my downloads from any computer.
When trying to change the location of the temporary folder of Ktorrent , I see that the program does not allow me to select that route.

The network hard drive is in NTFS format, and I have full permissions to access, read and write.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: ktorrent 4.3.1-2ubuntu1
ProcVersionSignature: Ubuntu 3.13.0-40.69-generic 3.13.11.10
Uname: Linux 3.13.0-40-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.14.1-0ubuntu3.6
Architecture: amd64
CurrentDesktop: KDE
Date: Sat Jan 31 21:59:07 2015
InstallationDate: Installed on 2014-06-13 (232 days ago)
InstallationMedia: Kubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140416.1)
SourcePackage: ktorrent
UpgradeStatus: No upgrade log present (probably fresh install)