I couldn't find any "geometry" option in the trunk version of lyx. Weher is the code for the geometry option? Has it been removed? Do you mix branches?
In lyxrc.h, session-related options are /// whether or not go to saved position when opening a file bool use_lastfilepos; /// load files from last session automatically bool load_session; /// Width of MainWindow. if 0, value from last session will be used int geometry_width; /// Height of MainWindow, if 0, value from last session will be used int geometry_height; /// Whether or not save/restore windows position as session info bool geometry_xysaved; The latter three are the ones that need go to preference. Bo