ComboBox & Notebook Pane Bug

[Allen <allen saucier cas-inc com>]

Hi all,

has anyone seen this bug:  I have a window w/ a notebook tabs pane on 
it.  2 tabs.  The first one has no combo boxes on it.  The 2nd tab has 
several.  When I start my application, switch to the 2nd tab, click any 
of my combo boxes, chose a value, then switch back to my 1st tab and 
exit the application, I get

(fire_mortars.exe:4836): GLib-GObject-CRITICAL **: g_object_ref: 
assertion `object->ref_count > 0' failed
Press any key to continue . . .

and a fatal error & my program crashes on exit.  This error occurs with 
ALL combo boxes on this page using this sequence. 

But, when I start my app, go to the 2nd tab, DON'T  click on any combo 
box, go back to the 1st tab and exit.  All is fine. 

I'm using Gtk 2.10.6 from    http://gladewin32.sourceforge.net/modules/news/
& Gtkmm 2.10.6 from 
http://ftp.gnome.org/pub/gnome/binaries/win32/gtkmm/2.10/

I am unable to use the latest version of Gtk with Gtkmm from these sites 
because when I run my apps after a complete recompile, I get some run 
time error - that I can't remember what it is.  After 2 attempts, I quit 
and went back to what I knew worked.

Has anyone seen this?
If you have a solution, would you please let me know what you've done?  
Thanks so much.

--Sincerely, Allen