No problems with making these...
In her book-Bittersweet,in the introduction to the brownie recipes, Alice says to get the chocolate /butter mixture quite hot--about 150 degrees F., then immediately add the sugar and salt and vanilla and stir. She is emphatic about beating enough after the flour is added.
I followed her directions to the letter, and was very pleased. I think I used Ghiradelli chocolate for the batches I mailed, and regular sugar-the direction don't call for superfine sugar. I placed the uncut square of brownies between two pieces of heavy cardboard for mailing: Jenna said they were just fine when the box arrived at her dorm.