I don't know why, perhaps it depends on star location or something, but every new version of glade wants to save the file differently. Fof example, I have this file saved in 3.3.3 (according to comment in it)

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE glade-interface SYSTEM "glade-2.0.dtd">
<!--Generated with glade3 3.3.3 on Mon Sep 24 10:38:22 2007 -->

I open it in today's trunk, hit Save and get unreadable diff (137-line patch, all because it reorders children widgets). It makes it impossible to inspect the changes in the file and so I fear to use glade and instead edit file manually whenever possible. It also leads to funny commits like "Re-saved with glade-x.x". Every time I hope that this version of glade will finally stop doing that, but it doesn't!