First off, can you list the version numbers for:
gtk, gtkmm, glade, and libglademm
You should be able to check them with:
$ pkg-config --modversion gtk+-2.0
$ pkg-config --modversion gtkmm-2.4
$ pkg-config --modversion libglade-2.0
$ pkg-config --modversion libgaldemm-2.4
Jeff, if you have a chance, could you post the least amount of
compilable code that generates this error, along with the glade file.
That'll help making a simple test case to try and isolate the problem.
I did some looking around on bugzilla, but I didn't see anything
related at first glance. I was pretty sure I read an email not too
long ago about a problem similar to this, then again, I could be
crazy.
Paul Davis