annoying wpmu-nelo behavior

Hello

I have spent the last 20 minutes trying to modify the custome homepage images on a wpmu nelo install. I delete the previous image, and then it asks me to upload a new one, which I do. It then shows me the new image, and aks me to crop and save, which I do. Except…. at the end of all this it shows the old(supposedly delted) picture again???

Is there anything that can be done?

Marco