Since no one tried to troubleshoot this, I did it by myself. I cleared environment from all variables and started to add them back one by one. Then I found that
* GTK2_RC_FILES=/etc/gtk-2.0/gtkrc:/home/krasu/.gtkrc-2.0:/home/krasu/.gtkrc-2.0-kde:/home/krasu/.kde/share/config/gtkrc-2.0 * is causing the problem. I removed all working components from this variable, and found that *~/.gtkrc-2.0-kde* OR *~/.gtkrc-2.0-kde* are causing the problem. Config files themselves: ************* $ cat /home/krasu/.gtkrc-2.0 # -- THEME AUTO-WRITTEN DO NOT EDIT include "/usr/share/themes/Clearlooks/gtk-2.0/gtkrc" style "user-font" { font_name = "Tahoma 8" } widget_class "*" style "user-font" gtk-font-name="Tahoma 8" include "/home/krasu/.gtkrc.mine" # -- THEME AUTO-WRITTEN DO NOT EDIT $ cat /home/krasu/.gtkrc-2.0-kde # This file was written by KDE # You can edit it in the KDE control center, under "GTK Styles and Fonts" include "/usr/share/themes/Qt4/gtk-2.0/gtkrc" style "user-font" { font_name="Tahoma" } gtk-theme-name="Qt4" gtk-font-name="Tahoma 8" ************* The bug is reproduced when *GTK2_RC_FILES=/home/krasu/.gtkrc-2.0* or when * GTK2_RC_FILES=/home/krasu/.gtkrc-2.0-kde*. Then I set *export GTK2_RC_FILES=/home/krasu/.gtkrc-2.0* and tried to debug a little bit this config file. Finally I found that *gtk-font-name="Tahoma 8"* is causing the problem. This file was written by gtk-chtheme. I don't know HOW can font size break reportbug's GTK frontend, but it breaks. All other GTK apps (native apps w/o python bindings) work fine. So, as I already said, this is a bug in reportbug or python-gtk2. -- Regards, Krasu