I want to use Query Posts to not show posts within a certain category. But the field 'category__not_in' seems not to be filtering at all (as seems the case with 'category__in'). 'category_name' and 'tag' for example do work.
Another strange behavior:
When I put the Query Posts widget in 'Utility: Before Content' (Hybrid Hook Widgets) the page in which I show this widget (#content) does also show ALL other posts after the widget. When I put the Query Posts widget in 'Utility: After Content' the page only shows the post which I've defined. Do we have a bug here?