(gdk_char_width_wc): assertion failed

[Mike Patnode <mpatnode telocity com>]

I'm getting the following assertion failure with  umlate(sp?) characters when putting it in the text entry.  The string I'm trying to put in is:

           Ouvertüre

The worst part is this only happens on one machine, on my second machine the exact same code works fine.  Any suggestions?

thx
mp
-----------------------

Gdk-ERROR **: file gdkfont.c: line 504 (gdk_char_width_wc): assertion failed: (w
ctomb(&c,character) == 1)
aborting...

Program received signal SIGABRT, Aborted.
[Switching to Thread 1024 (LWP 22868)]
0x403178d1 in __kill () from /lib/libc.so.6
(gdb) where
#0  0x403178d1 in __kill () from /lib/libc.so.6
#1  0x402ce1aa in raise (sig=6) at signals.c:65
#2  0x40318cb8 in abort () at ../sysdeps/generic/abort.c:88
#3  0x4019f6ce in g_logv (log_domain=0x40181a2e "Gdk",
    log_level=G_LOG_LEVEL_ERROR,
    format=0x40181ba0 "file %s: line %d (%s): assertion failed: (%s)",
    args1=0xbfffe93c) at gmessages.c:391
#4  0x4019f76f in g_log (log_domain=0x40181a2e "Gdk",
    log_level=G_LOG_LEVEL_ERROR,
    format=0x40181ba0 "file %s: line %d (%s): assertion failed: (%s)")
    at gmessages.c:408
#5  0x4016cdf3 in gdk_char_width_wc () at eval.c:41
#6  0x40089ffe in gtk_entry_insert_text () at eval.c:41
#7  0x400b53e0 in gtk_marshal_NONE__POINTER_INT_POINTER () at eval.c:41
#8  0x400e7c7d in gtk_signal_real_emit () at eval.c:41
#9  0x400e59f5 in gtk_signal_emit () at eval.c:41
#10 0x400853b8 in gtk_editable_insert_text () at eval.c:41
#11 0x40086edf in gtk_entry_set_text () at eval.c:41