Calling gnuplot fails, when canceled DDD crashes

[Schmitt]

Hi,
Everytime i try to call gnuplot to display some variable, DDD doesn get
further than the announcement. (I refer to the small window telling that
gnuplot is starting or something.) When clicking on cancel the whole
thing crashes...
Thats all I can tell You, but please ask for any infomation You need, I
am glad to help.
gnuplot is installed:
        G N U P L O T
        Version 4.2 patchlevel 0
        last modified March 2007
        System: Linux 2.6.22-14-generic
I am working on ubuntu gutsy, kernel Linux 2.6.22-14-generic and GNOME.
Keep up the great work,
Pal

log
Description: Binary data