XmLabel pixmaps replaced with pixmap of same resolution do not update

1)
Distributor ID: Ubuntu
Description: Ubuntu 14.04.1 LTS
Release: 14.04
Codename: trusty

2)
ii xserver-common 2:1.15.1-0ubuntu2.1 all common files used by various X servers
ii xserver-xorg 1:7.7+1ubuntu8 i386 X.Org X server
ii xserver-xorg-core 2:1.15.1-0ubuntu2.1 i386 Xorg X server - core server
ii xserver-xorg-dev 2:1.15.1-0ubuntu2.1 i386 Xorg X server - development files

Run with: /usr/bin/X -core :0 -seat seat0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch

root@osdev:/tmp# xdpyinfo|grep back
options: backing-store WHEN MAPPED, save-unders NO

3) The pixmap displayed on the screen should update with the new pixmap after calling XtVaSetValues().

4) The old pixmap remained on the screen. This only occurs with pixmaps of the same dimensions.