I first made my grids with the free version. Then I updated to the Premium version. Now I am no longer able to do a query post via post taxonomies and terms. When I click on "Categorie" - no categories are shown for me to choose from. In all of my old grids - I can also no longer change the category. Plus on one of my old grids - it is now showing posts from all categories instead of just the one category of "Guest photographers". https://impressions.bicyclingaroundtheworld.nl/bicycle-touring-guest-photographers/
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You should see a data update notice at top on dashboard, you should run this by click on update link, please see the screenshot, after running it will display categories from old version.
After completing the update, you will able to see categories under each taxonomy by expanding,
this is the most advanced taxonomy query we updated in recent version.