We are in the process of setting up a new AEM 6.3 server. For some reason the images have stopped showing up in the side panel when editing a page. If I open a page in classic view, they don't show up in the content finder either. I can navigate to the images through the Assets folder so I know that it's not a permissions issue. Also all the renditions appear to be there.
By description of issue,it seems that few bundles might not have started correctly (Please check bundles console). But, As you are setting up a new instance, try starting a fresh one again after deleting the old crx-quickstart folder.
