Cairo Segfaults

[myaconis nycap rr com]

I have an interesting problem.  I have a FC5 box set up with 
GTK+2.8.15. It seems when I run GTK applications through xthinpro from 
Windows PCs that are close in proximity to the server they run without 
any difficulty.  However, from further distances (i.e. the server is 
in Washington D.C. and the xthinpro client is in New York) all the GTK 
applications crash with a similar backtrace as listed at the end of 
this email.

Does anyone know what is happening here?  The applications flash on 
the screen for a brief period of time (don't even get initialized) 
then crash...

Thanks,

Matt

#1  0x00d794d9 in _cairo_pixman_composite_triangles ()
   from /usr/lib/libcairo.so.2
#2  0x00d7a0bc in _cairo_pixman_composite_triangles ()
   from /usr/lib/libcairo.so.2
#3  0x00d6c9f2 in _cairo_pixman_composite () 
from /usr/lib/libcairo.so.2
#4  0x00d5145f in cairo_font_options_create () 
from /usr/lib/libcairo.so.2
#5  0x00d5728f in cairo_surface_reference () 
from /usr/lib/libcairo.so.2
#6  0x00d4e65f in cairo_font_options_create () 
from /usr/lib/libcairo.so.2
#7  0x00d4e8c5 in cairo_font_options_create () 
from /usr/lib/libcairo.so.2
#8  0x00d4f29c in cairo_font_options_create () 
from /usr/lib/libcairo.so.2
#9  0x00d4f4c7 in cairo_font_options_create () 
from /usr/lib/libcairo.so.2
#10 0x00d4f67a in cairo_font_options_create () 
from /usr/lib/libcairo.so.2
#11 0x00d48779 in cairo_stroke_preserve () from /usr/lib/libcairo.so.2
#12 0x00d487a2 in cairo_stroke () from /usr/lib/libcairo.so.2
#13 0x001e7dca in clearlooks_draw_progressbar_trough ()
   from /usr/lib/gtk-2.0/2.4.0/engines/libclearlooks.so
#14 0x001e2e15 in clearlooks_style_register_type ()
   from /usr/lib/gtk-2.0/2.4.0/engines/libclearlooks.so
#15 0x003bfd0a in gtk_paint_box () from /usr/lib/libgtk-x11-2.0.so.0
#16 0x00396d55 in gtk_progress_bar_set_bar_style ()
   from /usr/lib/libgtk-x11-2.0.so.0