When you start the wxPython GRASS GUI under KDE on OpenSUSE 11.4, you will get following error: "GLib-GObject-WARNING **: invalid cast from` GtkCheckButton 'to `GtkTreeView'. " This seems to be a problem in the wx 2.9.1.1 package in OpenSUSE.

As a work around you can use either GNOME or another window manager - open System Preferences -> Appearance of applications -> GTK styles and fonts and change to the GTK styles Raleigh or sonar. This makes the wxPython user interface work again without problems.