I'm having issues trying to display a category name when using the related categories option. Two snippets below:
{exp:channel:entries channel="blog" limit="4" related_categories_mode="yes" custom_fields="yes"}
And inside of the above:
{categories limit="1" show="not 1"}{category_name}{/categories}
When I remove related_categories_mode
the categories will display fine, but it's unfortunately necessary for this situation.