Did you see the Shortcode Examples on http://wordpress.org/support/plugin/testimonials-widget?
There’s more than one category example.
I’ve tried to filter by category and it won’t work. Only by using tags to filter. Categories are useless. Very disappointed in this plug-in.
Thank you for your quick reply. I’ve worked on this for weeks. I’ve read your FAQ’s and Knowledgebase articles.
I only have 3 categories. One is nested.
“Resources”, “Resources->Free”, “News”
None of these are picked up by the widget or short code
Currently, that’s the least of my worries with this plug in…
It seems like you might have multiple instances of these category names, therefore slugs need to be used.
Once you’re back online, email support@aihr.us with an admin login and I’ll try to help debug things.