<snip>
> ... when I try to open an wx.MessageDialog I get errors like
> these and no icon gets displayed:
>
> (python:6539): Gtk-WARNING **: Error loading icon: Failed to load image
> '/opt/kde3/share/icons/crystalsvg/22x22/actions/button_ok.png':
> Transformed PNG has zero width or height.
>
<snip>
Have you tried with other GTK apps that use stock buttons? You may also
want to try running them from a terminal window so you can see if any
different log messages are generated, that may give some additional clues.
That didn't help much, but I finally got a weird idea: It was to set the
default icon theme once more. It was already set, but changing it, setting it
back again and restarting my app helped. (And I have NO clue why.)
Thanks anyway,
Cheers
Christian