Here is what I get when I launch xmaeme in xterm and then try to launch starcas. Please note, the initial error messages come up before I even try to launch the ROM:

BusyBox v1.4.1 (2007-03-12 19:00:25 EET) Built-in shell (ash)
Enter 'help' for a list of built-in commands.

~ $ xmaeme
xmaeme[2188]: GLIB CRITICAL ** GLib-GObject - g_object_unref: assertion `G_IS_OBJECT (object)' failed
xmaeme[2188]: GLIB CRITICAL ** GLib-GObject - g_object_unref: assertion `G_IS_OBJECT (object)' failed
xmaeme[2188]: GLIB CRITICAL ** GLib-GObject - g_object_unref: assertion `G_IS_OBJECT (object)' failed
xmaeme[2188]: GLIB CRITICAL ** GLib-GObject - g_object_unref: assertion `G_IS_OBJECT (object)' failed
Error opening /media/mmc1/roms/mame/: No such file or directory
Error opening /media/mmc1/roms/: 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
xmaeme[2188]: GLIB WARNING ** Gtk - gtksettings.c:826: an rc-data property "gtk-file-chooser-backend" already exists
SCANNING FOR VISIBILITY
SCANNING FOR VISIBILITY
xmaeme[2188]: GLIB CRITICAL ** Gtk - gtk_tree_model_filter_convert_child_iter_to_iter: assertion `path != NULL' failed
xmaeme[2188]: GLIB CRITICAL ** Gtk - gtk_tree_model_filter_get_path: assertion `GTK_TREE_MODEL_FILTER (model)->priv->stamp == iter->stamp' failed
xmaeme[2188]: GLIB CRITICAL ** Gtk - gtk_tree_view_expand_to_path: assertion `path != NULL' failed
xmaeme[2188]: GLIB CRITICAL ** Gtk - gtk_tree_view_set_cursor_on_cell: assertion `path != NULL' failedxmaeme[2188]: GLIB DEBUG ConIc - con_ic_connection_send_event(0xd41d0, AMDNET, WLAN_INFRA, 0)
SCANNING FOR VISIBILITY
SCANNING FOR VISIBILITY
xmaeme[2188]: GLIB CRITICAL ** Gtk - gtk_tree_model_filter_row_has_child_toggled: assertion `elt->visible' failed
xmaeme[2188]: GLIB CRITICAL ** Gtk - gtk_tree_model_filter_row_has_child_toggled: assertion `elt->visible' failed
Child: running xmame /home/user/MyDocs/.games/mame/roms/starcas -fullscreen -ror -scale 2 (null) (null)
SDL: Info: SDL initialized
info: trying to parse: /usr/lib/xmame/xmamerc
error: unknown option artwork_directory, on line 10 of file: /usr/lib/xmame/xmamerc
ignoring line
error: unknown option cheat_file, on line 11 of file: /usr/lib/xmame/xmamerc
ignoring line
error: unknown option hiscore_file, on line 12 of file: /usr/lib/xmame/xmamerc
ignoring line
error: unknown option history_file, on line 13 of file: /usr/lib/xmame/xmamerc
ignoring line
error: unknown option mameinfo_file, on line 14 of file: /usr/lib/xmame/xmamerc
ignoring line
error: unknown option inipath, on line 17 of file: /usr/lib/xmame/xmamerc
ignoring line
error: unknown option ctrlr_directory, on line 18 of file: /usr/lib/xmame/xmamerc
ignoring line
error: unknown option cfg_directory, on line 21 of file: /usr/lib/xmame/xmamerc
ignoring line
error: unknown option nvram_directory, on line 22 of file: /usr/lib/xmame/xmamerc
ignoring line
error: unknown option memcard_directory, on line 23 of file: /usr/lib/xmame/xmamerc
ignoring line
error: unknown option input_directory, on line 24 of file: /usr/lib/xmame/xmamerc
ignoring line
error: unknown option hiscore_directory, on line 25 of file: /usr/lib/xmame/xmamerc
ignoring line
error: unknown option state_directory, on line 26 of file: /usr/lib/xmame/xmamerc
ignoring line
error: unknown option snapshot_directory, on line 27 of file: /usr/lib/xmame/xmamerc
ignoring line
error: unknown option diff_directory, on line 28 of file: /usr/lib/xmame/xmamerc
ignoring line
error: unknown option skip_disclaimer, on line 35 of file: /usr/lib/xmame/xmamerc
ignoring line
error: unknown option skip_gameinfo, on line 36 of file: /usr/lib/xmame/xmamerc
ignoring line
error: unknown option bios, on line 37 of file: /usr/lib/xmame/xmamerc
ignoring line
info: trying to parse: /home/user/.xmame/xmamerc
info: trying to parse: /usr/lib/xmame/xmame-SDLrc
info: trying to parse: /home/user/.xmame/xmame-SDLrc
info: trying to parse: /usr/lib/xmame/rc/starcasrc
info: trying to parse: /home/user/.xmame/rc/starcasrc
Mouse/Trakball selected.
loading rom 0: starcas3.t7
loading rom 1: starcas3.p7
loading rom 2: starcas3.u7
loading rom 3: starcas3.r7
done
SDL: Info: Video mode set as 800 x 480, depth 16
Using dirty_buffer strategy
Using 16bpp video mode
Game uses 3 colors
SDL: sysdep_display_alloc_palette(32768);
error: /dev/dsp: No such file or directory
info: sysdep_dsp: using esound plugin
info: dsp: using timer based audio
info: sysdep_mixer: using oss plugin
Fatal signal: Segmentation Fault (SDL Parachute Deployed)

Right after the segfault I xmaeme displays "unable to load ROM" message.