dia "quits unexpectedly" on startup - no symbol table info available?

[gabrielle <gab gorge net>]

Hello all.
I'm using dia on Fedora Core 3 + gnome desktop.  Recently, I started
getting the message "The Application "dia" has quit unexpectedly."
There is an option to restart, close, or inform the developers.  Restart
does nothing.  Close works. ;)  "Inform developers" creates a file that
starts with "Backtrace was generated from /usr/bin/dia."  (rest of it is
below.)

What I was doing before this started happening:  I'd been experimenting
with adding my own shapes & had that working successfully once.  The
next time I went to start dia, blam.  I tried moving my new shapes &
sheets somewhere else but that didn't solve the problem.

If somebody could help me figure out what to do next so I can get back
to my experiments, I'd appreciate it. :)

TIA
gabrielle

---debug output---
Backtrace was generated from '/usr/bin/dia'

(no debugging symbols found)...Using host libthread_db library
"/lib/tls/libthread_db.so.1".
(no debugging symbols found)...`shared object read from target memory'
has disappeared; keeping its symbols.
(no debugging symbols found)...(no debugging symbols found)...(no
debugging symbols found)...(no debugging symbols found)...(no debugging
symbols found)...(no debugging symbols found)...(no debugging symbols
found)...(no debugging symbols found)...[Thread debugging using
libthread_db enabled]
[New Thread -1208351040 (LWP 4454)]
(no debugging symbols found)...<this was repeated 87 more times, cut to
save space>...0x00aaa402 in __kernel_vsyscall ()
#0  0x00aaa402 in __kernel_vsyscall ()
#1  0x00baf2f3 in __waitpid_nocancel () from /lib/tls/libpthread.so.0
#2  0x0663bf50 in libgnomeui_module_info_get ()
from /usr/lib/libgnomeui-2.so.0
#3  <signal handler called>
#4  0x00d273b2 in dia_plugin_init ()
from /usr/lib/dia/libstandard_objects.so
#5  0x001386b8 in dia_object_defaults_load ()
from /usr/lib/dia/libdia.so
#6  0x0806b037 in app_init ()
#7  0x0809a945 in main ()

Thread 1 (Thread -1208351040 (LWP 4454)):
#0  0x00aaa402 in __kernel_vsyscall ()
No symbol table info available.
#1  0x00baf2f3 in __waitpid_nocancel () from /lib/tls/libpthread.so.0
No symbol table info available.
#2  0x0663bf50 in libgnomeui_module_info_get ()
from /usr/lib/libgnomeui-2.so.0
No symbol table info available.
#3  <signal handler called>
No symbol table info available.
#4  0x00d273b2 in dia_plugin_init ()
from /usr/lib/dia/libstandard_objects.so
No symbol table info available.
#5  0x001386b8 in dia_object_defaults_load ()
from /usr/lib/dia/libdia.so
No symbol table info available.
#6  0x0806b037 in app_init ()
No symbol table info available.
#7  0x0809a945 in main ()
No symbol table info available.
---end debug output---