User-Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0; SLCC1; .NET CLR 2.0.50727; Media Center PC 5.0; .NET CLR 3.0.04506; .NET CLR 1.1.4322) Build Identifier: version 126.96.36.199 (20080708) When there are duplicate Email addresses, even with different display names, one of the or the other will be dropped on the list (sometimes the first and sometimes the lastwithout apparent reason). If you delete the error address then neither can be dragged and dropped. There is never an error message If a drag and drop is not completed there must be an error for intgegrity. Reproducible: Always Steps to Reproduce: 1. Create Card as "a1 b", firstname.lastname@example.org (husband) 2. Create Card as "a2 b", email@example.com (wife) 3. Drag "a2 b" to list and "a1 b" is dropped instead of the dragged Card. 4. Delete the incorrect Card from list and neither Card can be dragged to list. Actual Results: "a1 b" Card is dropped instead of the dragged "a2 b" Card. see above Expected Results: Drop the dragged Card onto the list 1. Drop the dragged Card onto the list 2. display abn error if the item can not be dropped (integrity).