Hello, im so sorry for this error. You have send us your login, so I was be able to take a look at it. There is something wrong with your WordPress installation, maybe with one of the plugins you use. Everytime when i try to attache an image to a slider / pictureset, WordPress show me the following message: ‘Cheatin’ uh?’. Thats not normal!
If it is ok for you, we run an extra test on our Server to detect the problem. But it will take circa one day. Then we can update your theme / remove the error. You can be sure: we help you until it works fine for you.