Release : 12.1
Component : CA OUTPUT MANAGEMENT WEB VIEWER FOR ALL PLATFORMS
Operating System: Windows Server
This is not a Web Viewer problem.
If when you try to access a particular report, you get the error "Error: User not authorized to access report.," that would be beyond the control of the Web Viewer. The Web Viewer is simply echoing the message it's getting from CA View/SAR.
You should go to the CA View/security administrator for your organization to ask why your ID does not have access to that report. Once that is resolved, you should be able to see the report through Web Viewer.