~ $ xmaeme xmaeme[2299]: GLIB WARNING ** libglade - unknown widget class 'GtkFileChooserButton'
xmaeme[2299]: GLIB WARNING ** GLib-GObject - invalid cast from `GtkLabel' to `GtkFileChooser'
xmaeme[2299]: GLIB CRITICAL ** Gtk - gtk_file_chooser_set_current_folder: assertion `GTK_IS_FILE_CHOOSER (chooser)' failed
Error opening /media/mmc1/roms/mame/: No such file or directory
Error opening /media/mmc2/roms/mame/: No such file or directory
Error opening /media/mmc2/roms/: No such file or directory
Error opening /home/user/MyDocs/.documents/.games/: No such file or directory
Error opening /media/mmc1/roms/gba/: No such file or directory
Error opening /media/mmc2/roms/gba/: No such file or directory
Error opening /home/user/MyDocs/.documents/.games/: No such file or directory
Error opening /media/mmc2/roms/neogeo/: No such file or directory
Error opening /home/user/MyDocs/.documents/.games/: No such file or directory
xmaeme[2299]: GLIB DEBUG ConIc - con_ic_connection_send_event(0x99d90, 0dyssey, WLAN_INFRA, 0)
xmaeme[2299]: GLIB CRITICAL ** Gtk - gtk_tree_model_filter_row_has_child_toggled: assertion `elt->visible' failed
xmaeme[2299]: GLIB CRITICAL ** Gtk - gtk_tree_model_filter_row_has_child_toggled: assertion `elt->visible' failed
xmaeme[2299]: GLIB WARNING ** GLib-GObject - invalid cast from `GtkLabel' to `GtkFileChooser'
xmaeme[2299]: GLIB CRITICAL ** Gtk - gtk_file_chooser_get_filename: assertion `GTK_IS_FILE_CHOOSER (chooser)' failed
Child: running gngeo --sound --samplerate=11025 --fullscreen --scale=2 --biospath=(null) /media/mmc1/roms/neogeo/magdrop2.zip (null) (null) (null)
The following bios files are missing :

(null)/sp-s2.sp1
(null)/sfix.sfx
(null)/000-lo.lo

seems like xmeame doesn't know that the biospath for gngeo is on the mmc1 card. --biospath=(null)
guess its a xmaeme issue...