Steps to reproduce:
1. Obtain the current GTK+ Stable release from
http://gimp-win.sourceforge.net/stable.html or the one included with GAIM
2. Install it in a Windoze '98SE, then simply open any GTK+ Application 
3. The app crashes with a MS-DOS prompt message before showing anything onscreen:

GLib-CRITICAL **: g_strsplit: assertion 'string != NULL' failed


Stack trace:
LIBRO provocó un error de página no válida ["Invalid Page Error"] en el 
módulo LIBGTK-WIN32-2.0-0.DLL de 0167:006dd3ae.
Registros ["Registers"?]:
EAX=00000000 CS=0167 EIP=006dd3ae EFLGS=00010206
EBX=00ea9b70 SS=016f ESP=00d4ca30 EBP=00d4ca58
ECX=00000000 DS=016f ESI=00ea9bc0 FS=2267
EDX=00000008 ES=016f EDI=00000000 GS=0000
Bytes en CS:EIP:
,02x ,02x ,02x ,02x ,02x ,02x ,02x ,02x ,02x ,02x ,02x ,02x ,02x ,02x ,02x ,02x 
Volcado de pila ["Stack dump"?]:
,08x ,08x ,08x ,08x ,08x ,08x ,08x ,08x ,08x ,08x ,08x ,08x ,08x ,08x ,08x ,08x 

Other information:
The app crashes just the same when compiled for GTK+ 2.4.14 or GTK+ 2.6.4, there
is no difference.
GAIM 1.2.1 and GIMP both crash just the same, only they've hidden their DOS prompts.