What are the changes on unpaid items?

What new changes? Buyer doesn't pay, after 4 days open an unpaid item dispute, buyer still doesn't pay, close dispute after 4 days, you get your fees back, buyer gets a strike, you relist. That's how it's been since the strike system came in. Nothing has changed. If you are cancelling transactions because a buyer doesn't pay, more fool you. You are letting them get away with it and telling them that it's OK to not pay.

Have you set your account settings to block buyers with two or more unpaid strikes from buying your items ? This does help to stop some of the time wasters from bidding / buying your items.