Gtk-WARNING + strange behavior

[daman poczta fm <daman poczta fm>]

Hello.
perhaps it is not a good place to put my mail but I will try anyway ;-)
I have Helix gnome installed (over standard mandrake 7.1 Gnome).
My problem is strange behavior of some Gtk apps. When I run eg. Glade (0.59)
first I have some warnings:
Gtk-WARNING: could not find libxeno.so

then
GnomeUI-Warning: Authentication rejected. Reason: none of auth. protocols are
supported...

Then glade runs but it is really hard to use it - the app seems like it "does
not understand" mouse. My left button does not work at all. I can only select
widgets with right one but that's all. Then I have to use keyboard to press
enrter, tabs etc.
There are also other aplications that behaves like glade (ie. any app that I
build with glade...).
Could you please tell me where can I find libxeno.so and/or what is the problem
with those apps?
Thanks,
_Adam_