I am not sure if this is a Beta bug or resource bug ... but since I am running beta ...
A media search for Basilica produces multiple hits (below, centre), including one from the resource 'Twenty Centuries of Christian Worship (Library of Christian Worship: Volume 2).' The thumbnail for this can be seen at the top of the search panel.
Clicking on the thumbnail opens the resource but all the images are shown as grey or white squares.
If I use the context menu on the grey square, and send to keynote, I can then see the image in Keynote.

As an aside, is there any way to make the 'media collections' section display more that the current 'few at a time' UI with 'next page' links?
Thanks.