It’s been brought to my attention by Angie Hammond that the syntax help for a number of shortcodes is wrong. Specifically the
category parameter should be
category_name when you are specifying the category-slug
The bug is in the oik plugin, but it affects the syntax help for the oik-nivo-slider’s [nivo] shortcode.
This problem affects the following shortcodes: [nivo], [bw_pages], [bw_posts], [bw_tree]
I apologise for this, I copied and pasted the defaults from the WordPress codex for get_posts() but didn’t fully appreciate ALL the options for specifying the category to display.
If you use category=nnn then the value you pass for nnn is the category ID If you use category_name=slug then the value you pass for slug is the cateogry-slug ( NOT the name )