I see.
Im going to set up a brand new WP-site, and test it out there too.
What Im doing is; in my Widget, I click the Dynamic link so I enter the settings for the Dynamic widget that you created.
Then I click on the “Set all options to ‘No’ (Except overriding options like Role, Date, etc.)” I click ok and add the checkbox; “Individual Posts, Custom Post Types and Tags
Make exception rule available to individual posts and tags”
Then I click on the “Show widget default on single posts? info
Yes No ”
This I set to Yes, and here is the problem;
Im not able to mark any of the “Except the author(s) / or / Except the categories”
So its eaither ON or OFF, no exceptions is possible. If you want I can give you admin access on my DEV site, same there. its a copy.