In puppet_gui/manifest.xml removed dependency on rviz_backdrop. in puppet_gui/nodes/puppet_gui.py: set Backdrop.Enabled=0 in config.write statement for both branches of conditional. Problem: rviz_backdrop does not work in Groovy.
More fuzzing with manifest and stacks to get Groovy running.
Removed package rviz_backdrop for now. Not working in Groovy