Our luck with Luke in nursery ended very quickly. Within a couple weeks he was crying when we left him and I've spent most of nursery time with him lately. We hope that improves soon.
On the positive side, we recently exchanged his crib rail with a shorter rail that has an opening where he can crawl in and out without our help. Although he seemed to love the change and crawled into his crib the first night, it was scary the first night as we weren't sure whether he'd wake up in the middle of the night, forget about the change and end up flipping head first over the shorter railing. He did great though, in part due to my running in as fast as I could that first night when I heard him crying to help him notice the shorter rail. Since then he has been an angel. He almost always goes to bed willingly at his bed-time anyway, but now he occasionally comes to us in our bedroom in the middle of the night if he needs attention -- very often without crying at all. It's so exciting to have a son in our home that is feeling so grown up!