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Groupdocs Viewer for .NET not displaying file and icons

We have upgraded Kentico CMS to version 10 and all efforts to get the groupdocs viewer for .NET to display properly have been futile.

The page currently loads blank with the icons and document not displayed. See attachment. We would appreciate any help in moving past this stumbling block. We are using version 2.7 of the Groupdocs library as described in this guide -

Thanks in advance.


We are sorry to hear that you have such issue. First of all I should notify you that you use a very old version of the library which is not supported any more. Since that I can recommend you to migrate to the latest version of the GroupDocs.Viewer .

As for the issue - does you have added a handlers to the web.config? Also is there any errors in the browser console?
Commonly this issue occurs when a site uses an application pool set to Classis pipeline mode. In this mode you need to add an ISAPI handler for those icons. To do this, you have to add the following into the system.webServer/handlers section of your Web.config:
On 32-bit Windows:

On 64-bit Windows:

Also you can add such option to the web.config:

Best regards.