Shortcode not working, no posts displayed

I have installed the plugin and activated it. I want it to display a randomized list of posts on specific pages, so I’m using the following shortcode:

[arpw thumbnail=”true” thumbnail_size=”thumbnail” title=“true” title_url=“true” limit=“20” taxonomy=”27″ thumbnail_align=”left” excerpt=“true” excerpt_length=”10″ date=”false”]

Nothing is showing up though. 27 is a valid category number, and there are posts in that category.

https://ww.wp.xz.cn/plugins/advanced-random-posts-widget/