PS3 Media Server for ReadyNAS PRO

After I installed add-ons java, pms and mediap I was able to update the pms version to the latest:
-use add-on ssh (Enable Root SSH Access) to connect on RNDU (from windows using putty);
-copy tgz archive from http://code.google.com/p/ps3mediaserver/downloads/list to a temporary directory to unzip with:
tar -zxvf pms-generic-linux-unix-1.22.0.tgz
-next identify the process pms.jar with: ps -ef|grep pms

(admin 2212 1 9 20:23 ? 00:01:46 /c/addons-config/jre1.6.0_22/bin/java -Xmx768M -Xss16M -Dfile.encoding=UTF-8 -Djava.net.preferIPv4Stack=true -classpath /c/addons-config/pms/update.jar:/c/addons-config/pms/pms.jar:/c/addons-config/pms/plugins/:/c/addons-config/pms/plugins/* net.pms.PMS)

-next kill the process pms.jar; example: kill 2212 (or from graphical interface you can un-check then save "PMS for ReadyNAS" to stop the pms process)
-next copy only pms.jar (and optionaly xml files) from pms-generic-linux-unix-1.22.0.tgz archive to /c/addons-config/pms/
-next reboot NAS
(if you need to change config you can etit with vi /c/addons-config/pms/PMS.conf )

I have only one problem; I can't have thumbnails for video (On a Debian PC I have thumbnails for videos); I added in PMS.conf:
thumbnails = true
dvd_isos_thumbnails = true
thumbnail_seek_pos = 40
use_mplayer_for_video_thumbs = true

To me: media + video EQUAL thumbnails

I did not added details about linux commands; let me know if questions.