Your question was transferred to Telerik Reporting forum.
I opened active_walker.png attachment, however, it does not show any information just a blank space. Check if the correct image was chosen and test attaching it again.
Working demos that illustrate how to integrate HTML5 Viewer into the application can be found in product installation folder: [installation folder]\Progress\Telerik Reporting R3\ 2017\Examples\CSharp(VB).
I hope this information would help.
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