1) Edit image
2) Right click in the white area of "Animations"
3) Try to select the animation "Default" (only right click on item work)
Also in the animation window, if you move a animation into a folder, you can't move the element in the root path.
<img src="http://img850.imageshack.us/img850/6806/animationso.png" border="0" />
Add new animation outside of the folder then move the element out of the folder.
Please look at the items keyword: "multiple selection" what triggers a misbehavior, e.g., delete.