Hi there,
Thanks for writing in! If you switch back to the main theme, does everything work again? If it does then the issue lies somewhere in between. The child theme should just pull in the main theme. Since the pages are coming up blank and when inspecting your sample link it doesn’t even load the WordPress structure, something is definitely conflicting.
Would you mind providing us with more info on how you setup GeoDirectory, it may give us some clues to narrow things down? Thanks!