Some PDF documents not displaying correctly in RadPdfViewer - the text is missing, showing only box borders. The issue is not reproducible neither in PDF.js, nor in Kendo UI PDF Viewer:
Thank you for the reported issue!
As a possible workaround until this bug is fixed you can use the Kendo UI PDF viewer directly as the faced problem seems to be not reproducible there:https://demos.telerik.com/aspnet-ajax/pdfviewer/overview/defaultcs.aspx
In case you have other controls form the UI for ASP.NET AJAX suite on the page, you will need to apply the settings from the following help article in order to use them along with the Kendo UI widgets smoothly:https://docs.telerik.com/devtools/aspnet-ajax/controls/htmlchart/how-to/radhtmlchart-integration-with-kendoui-widgets
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