When using the Plex web app, clicking on a comic's thumbnail does nothing. I've tried Chrome and Edge on Windows 10, as well as Chrome, Opera, and others on Android 7.1.2.
The pages open correctly from a thumbnail when using a native Plex app. This worked for me with the UWP and Android apps.
Plex Media Server is version 3.9.1 on Ubuntu 16.04.02.
Attached is the browser's console output when clicking on a thumbnail.
WebAppError.txt