Look in the theme's gtkrc file for empty engine-tags. These are commonly used in
style "unstyle" which is meant to prevent Sodipodi from crashing while opening the Object-Style dialog.
Code:
style "unstyle"
{
engine ""
{
}
}
Fill the "" with a 'known' engine, e.g. pixmap, so that the code looks like this:
Code:
style "unstyle"
{
engine "pixmap"
{
}
}
This should correct the problem.