Pentaho - charts not displaying in CDE dashboards

Question

I installed Pentaho 5.3 community version on Windows. My problem is that when displaying a CDE dashboard, text is displaying just fine but charts do not display at all. I got this issue with both sample CDE dashboard and my own dashboards.

I see nothing into pentago log that could explain that problem. I gotr the problem with both Firefox and Chrom latest versions.

Any idea ?

Thank you