The latest update of Google Chrome browser is preventing viewing of Crystal Reports viewer. Chrome is gradually deprecating and droping support for NPAPI plugins including Java, Silverlight, and Unity.

For details, please read:
Chrome to Drop Support for NPAPI Plugins Including Java, Silverlight, and Unity
Chrome starts pushing Java off the Web by disabling plugins
To enable NPAPI in Chrome, open the browser and enter

chrome://flags/#enable-npapi

in the URL and press Enter. This will bring you to the following section.

Enable NPAPI Mac, Windows
Enables the use of NPAPI plugins. #enable-npapi
Enable

Click on Enable and restart Chrome.