Hi Nick, I’m having the same issue where I can’t exclude any category IDs from the widget. I’m using the cat ID numbers, and have selected “All Categories”. This even seemed to be working a week or two ago, but suddenly stopped working. I’ve tried playing around with the settings but haven’t been able to find a combination of settings that works.
Here’s a screenshot of the settings in case it helps:
https://screencast.com/t/Ozv8unPWMZZi