Hi!
I have a problem: I do not know how to filter properly by Issue categories. 
I’ll try do my best to explain my situation:
1.- I’ve created new Issues in the WordPress theme.

• This new Issues need new categories, so I created.

2.- Secondly I’ve created a new page and added the “Post Grid” option. My next action was click on edit options and

• check YES in the “Show filter”  
• and select “Tt-issue” in the General tab. 

Finally I went to the “Filter” tab of the Post Grid and…

• Filtered by “category(tt-issue-cat)
• I wrote in the option “exclude from the filter list” the Issues’ categories that I didn’t want to show in this page. 

But when I save all this process the Post Grid show all the categories and didn’t filtered well.
Could you help me to filter properly? 
Thanks!