I'm using PCIG extensively on my site, and I have found it to be very helpful, and it works pretty well. There does seem to be a problem with the ability to filter based on having criteria that is for specific categories and tags.
For example, I want to be able to pull from a list of over 800 posts, all of the posts that are in the category "bpm-suite" and apply another filter to that list, by using the tags_and filter. I've assigned the tag of BPMNTEST to two posts which are in the category of bpm-suite, and used the following shortcode [pcig category=bpm-suite tags_and=BPMNTEST display=list show=post_title links=post_title, category_name, subcategory_name hide_empty=true]
I find that the results generated from this short code are the same results that are generated from the following short code [pcig category=bpm-suite display=list show=post_title links=post_title, category_name, subcategory_name hide_empty=true]. Both of them display 3 pages, and 17 posts, when I expected the first shortcode to display only 2 posts.
As you compare the two shortcodes, notice that the 2nd shortcode does not include the tags_and filter criteria.
Can you help me understand if I'm doing something wrong, or if there is a defect?