konqueror settings disapear

Hi List, I installed kde-trinity and was about to configure konquerors file settings. The goal was to show previews of the picture of an inserted sdcard. Somewhere I tried to switch the file assosiation tothe embedded viewer. From that point on I don't get the settings menu anymore. If I open it via settings- configure konqueror I get a window with no content and a title "empty page". Any advice how to debug that? It's a debian wheezy, from which I try to run konqueror inside a LXDE session, many because TDE isn't starting at all... (getting a logout while/after TDE ist initializing peripherials)