$ cat /tmp/gdb-mousepad.txt 
GNU gdb 6.6-debian
Copyright (C) 2006 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "i486-linux-gnu"...
(no debugging symbols found)
Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1".
(gdb) handle SIG33 pass nostop noprint
Signal        Stop      Print   Pass to program Description
SIG33         No        No      Yes             Real-time event 33
(gdb) set pagination 0
(gdb) run
Starting program: /usr/bin/mousepad 
(no debugging symbols found)
Failed to read a valid object file image from memory.
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
[Thread debugging using libthread_db enabled]
[New Thread -1218640192 (LWP 18050)]

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread -1218640192 (LWP 18050)]
0xb7b40d5f in IA__gdk_drawable_get_screen (drawable=0x4c4c) at gdkdraw.c:202
202     gdkdraw.c: No such file or directory.
        in gdkdraw.c
(gdb) backtrace 
#0  0xb7b40d5f in IA__gdk_drawable_get_screen (drawable=0x4c4c) at gdkdraw.c:202
#1  0xb7b84178 in IA__gdk_window_new (parent=0x4c4c, attributes=0xbfc45614, attributes_mask=108) at gdkwindow-x11.c:673
#2  0xb7db3eef in text_window_realize (win=0x80f2c40, widget=0x8078f88) at gtktextview.c:7478
#3  0xb7db41a3 in set_window_width (text_view=0x80ba018, width=<value optimized out>, type=GTK_TEXT_WINDOW_LEFT, winp=0x80ba098) at gtktextview.c:8129
#4  0x08053914 in ?? ()
#5  0x080ba098 in ?? ()
#6  0x00000003 in ?? ()
#7  0x0000002d in ?? ()
#8  0x0804e11d in ?? ()
#9  0x080ae830 in ?? ()
#10 0x08055821 in ?? ()
#11 0xbfc456c8 in ?? ()
#12 0xb782332c in g_value_peek_pointer () from /usr/lib/libgobject-2.0.so.0
#13 0xb7ce1f58 in gtk_item_factory_callback_marshal (widget=0x60001, func_data=0x8078f88) at gtkitemfactory.c:188
#14 0xb780e9b9 in g_cclosure_marshal_VOID__VOID () from /usr/lib/libgobject-2.0.so.0
#15 0xb780162b in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0
#16 0xb78120e3 in ?? () from /usr/lib/libgobject-2.0.so.0
#17 0x080b02f8 in ?? ()
#18 0x00000000 in ?? ()
(gdb) info registers 
eax            0x80772f0        134705904
ecx            0x60001  393217
edx            0x8078f88        134713224
ebx            0xb7bac23c       -1212497348
esp            0xbfc45530       0xbfc45530
ebp            0xbfc45548       0xbfc45548
esi            0x4c4c   19532
edi            0x80f2c40        135212096
eip            0xb7b40d5f       0xb7b40d5f <IA__gdk_drawable_get_screen+31>
eflags         0x210202 [ IF RF ID ]
cs             0x73     115
ss             0x7b     123
ds             0x7b     123
es             0x7b     123
fs             0x0      0
gs             0x33     51
(gdb) thread apply all backtrace

Thread 1 (Thread -1218640192 (LWP 18050)):
#0  0xb7b40d5f in IA__gdk_drawable_get_screen (drawable=0x4c4c) at gdkdraw.c:202
#1  0xb7b84178 in IA__gdk_window_new (parent=0x4c4c, attributes=0xbfc45614, attributes_mask=108) at gdkwindow-x11.c:673
#2  0xb7db3eef in text_window_realize (win=0x80f2c40, widget=0x8078f88) at gtktextview.c:7478
#3  0xb7db41a3 in set_window_width (text_view=0x80ba018, width=<value optimized out>, type=GTK_TEXT_WINDOW_LEFT, winp=0x80ba098) at gtktextview.c:8129
#4  0x08053914 in ?? ()
#5  0x080ba098 in ?? ()
#6  0x00000003 in ?? ()
#7  0x0000002d in ?? ()
#8  0x0804e11d in ?? ()
#9  0x080ae830 in ?? ()
#10 0x08055821 in ?? ()
#11 0xbfc456c8 in ?? ()
#12 0xb782332c in g_value_peek_pointer () from /usr/lib/libgobject-2.0.so.0
#13 0xb7ce1f58 in gtk_item_factory_callback_marshal (widget=0x60001, func_data=0x8078f88) at gtkitemfactory.c:188
#14 0xb780e9b9 in g_cclosure_marshal_VOID__VOID () from /usr/lib/libgobject-2.0.so.0
#15 0xb780162b in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0
#16 0xb78120e3 in ?? () from /usr/lib/libgobject-2.0.so.0
#17 0x080b02f8 in ?? ()
#18 0x00000000 in ?? ()
(gdb) quit


I am also attaching the output of mousepad by using valgrind.  Hopefully with these you will be able to tell exactly what went wrong.  Thanks