Donut is a wonderful theme. Actually I have on site notification working with it (don't remember exactly how it is fixed). One issue I have found is this:
On the category list on the right side bar- there is count of the questions. This works fine. But when we enable the category for unanswered questions, there is no count and hence the category list gets scrambled a bit. I think I got this fixed by adding "float:right" to the below CSS class and removing some attribute from the category item class.
One more cool feature would be the add numbering for the questions displayed. I had this request from some users. On a single page this is not very difficult to do - I don't know if numbering can be done for all questions in display, but at least for a page this would be nice to have.