newbie gets segfault in gnome-session

[Halldor Orn Olafsson <halldoro raunvis hi is>]

 Hi all.

  I have a Debian potato and ever since the other
  day when I was editing MIME types from gmc
  almost no gnome applications work.

  An ltrace on gnome-session ends with the words

--------------------------------------------------------------------
  g_str_equal(0x08053f78, 0x400a37ae, 0x403f16ec, 0x0805bb18, 0) = 0
  g_str_equal(0x0805b6d0, 0x400a37ae, 0x403f16ec, 0x0805bb18, 0) = 1
  g_str_hash(0x400a37b6, 0x403f16ec, 0x0805bb18, 0, 0xbffffb18) =
  0x0a63fb34
  g_str_equal(0x0805bae8, 0x400a37b6, 0x403f16ec, 0x0805bb18, 0) = 1
  --- SIGSEGV (Segmentation fault) ---
  +++ killed by SIGSEGV +++
--------------------------------------------------------------------

  and an ltrace on panel shows

--------------------------------------------------------------------
[~] > ltrace panel
  __libc_start_main(0x08052870, 1, 0xbffffc44, 0x08050b30, 0x080795e0
<unfinishe
d ...>
  __register_frame_info(0x0807f610, 0x0807ff44, 0xbffffc04, 0x08050b55,
0x4056e2
e0) = 0x40027fe4
  bindtextdomain("gnome-core", "/usr/share/locale") =
"/usr/share/locale"
  textdomain("gnome-core")                          = "gnome-core"
  CORBA_exception_init(0xbffffbe8, 0x08079632, 0x08079632, 0x08079620,
0x4056e2e
0) = 0x08080860
  gnome_CORBA_init(0x08079643, 0x0807963d, 0xbffffc00, 0xbffffc44, 1
<unfinished
 ...>
  --- SIGSEGV (Segmentation fault) ---
  +++ killed by SIGSEGV +++
--------------------------------------------------------------------


  Do you make any sense of this ?

  I'm using the newest gnome debs f.ex.

   gnome-session 1.0.5-1
   gnome-panel 1.0.5-1

  How can I undo all configuration on my part on gnome ?
  I would really like to get gnome up and running again
  and I would like to hear what you think.

  Thank you.

     Halldór