* delete ~/.kde/share/config/kdiff3rc
* touch ~/.kde/share/config/kdiff3rc
* start kdiff3 from console, no parameters
kdiff3 opens with a dialog, asking for files you want to diff. Select configure in the lower left.
* configure as desired, e.g. change the font to Liberation Mono, Regular, size 10 to work around bug 999925.
* exit kdiff3
kdiff3rc now contains the new config, including a line
"Font=Liberation Mono,10,-1,5,50,0,0,0,0,0"
Found a workaround on Ubuntu 14.04 :
* delete ~/.kde/ share/config/ kdiff3rc share/config/ kdiff3rc
* touch ~/.kde/
* start kdiff3 from console, no parameters
kdiff3 opens with a dialog, asking for files you want to diff. Select configure in the lower left.
* configure as desired, e.g. change the font to Liberation Mono, Regular, size 10 to work around bug 999925.
* exit kdiff3
kdiff3rc now contains the new config, including a line -1,5,50, 0,0,0,0, 0"
"Font=Liberation Mono,10,