1.2.1 of GTK+ needs to be upgraded as a bug was found in it which would cause the menu drag/dropping in apps such as wmakerconf's menu editor to not work properly, when you drag a menu item to the place you want it to be, nothing happens, the developers have found the bug and will fix it (maybe in 1.2.2 or later), so upgrade might be neccessary.
The bug being referred to is a bug with reordering CLists with drag and drop. (It just didn't work at all) This was fixed in fact fixed in GTK+-1.2.3 - this really isn't update material, but if we do a maintenance release of the GNOME packages, we should do one of GTK+ as well.
This was fixed in 6.1.