Typically, on a show night, I'll add a new empty hour to the end of the log, then drag and drop carts across to. When running against SQLServer here, if I drag and drop a cart between Hour Start and Hour End, it'll go *above* Hour Start, with a garbage time of 48:00:00, for example. That can be repeated, dragging and dropping further items.  I can work around it for now by 'adding an hour with carts', choosing a random one and then the hour behaves as normal... even if that one cart is immediately deleted, leaving just hour start/end, I can happily drag and drop into it.  Blank hours not at the end of the log are completely unaffected.