Hi there,
I am having the same problems, with an update a couple of months ago. I originally rolled back visualizer, which got it working, however, recent updates to page builder (I suspect) have now prevented vizualizer working at all.
Page example is:
http://inclusionsocialratings.org/assessments/spr-encot/
Using:
Site Origin Page Builder 2.5.2
Visualizer: Charts and Graphs Lite 2.0.4
However, Vizualizer works in normal page editor:
http://inclusionsocialratings.org/test-page-2/
Many thanks in advance, Andrew