I had the editor up and running without any problems, showing all the buttons. I made numerous changes to my site and eventually noticed that the icons weren't displaying any more. I reuploaded the CuteSoft_Client folder but it hasnt helped. The actual buttons all still work.
 
The main thing I can think of that I changed is the name of the folder that my pages using the control are in. This was just a subfolder of the main site, not the folder that the CuteSoft_Client is in (obviously, seeing as that is in the root).