yast ncurses menus not properly formatted for tumbleweed ppc64 guest install

Detailed flow:
* On a Power KVM host I defined a libvirt twppc64.xml
  using the Tumbleweed-BE-DVD-ppc64-Snapshot20150505-Media.iso
  retrieved from https://openqa.opensuse.org/tests/60778/asset/3110
* from a ssh session to the PowerKVM I started a screen window
  from which I started the ppc64 guest.
  ===
  virsh define twppc64.xml
  virsh start --console twppc64
  ===
* I captured successively the ncurses menus and did a 
  yast2_ncurse_bad_format.tgz  tarball with all those png files.

* The first problem is that the text is not properly aligned
  eg: yast2_img1_installation.png

* The 2nd problem is that some characters from previous menu
  are not cleaned up when new menu is presented.
  eg: yast2_img4_installation_option.png

* The third problem is popup window hardly visible
  eg: yast2_img9_confirm_password.png