charts displaying incorrectly in NFA gui - cross icon

Document ID : KB000122478
Last Modified Date : 06/12/2018
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Issue:
charts are not displaying in the interfaces reports either on the console or a remote web browser : replaced by a small cross icon.

javascript well enabled in the browser

No HTTPS used .
Environment:
NFA 9.5
Cause:
NFA cannot create temporary image files in the graphics folderĀ 
Resolution:
give full control to the users group on the folder :
C:\CA\NFA\REPORTER\NetQoS.ReporterAnalyzer.WebSite\graphics