I am int Academy Course "Intro to UpFront" and have remade my home-page in the process at http://www.excelstories.com. However I get a strange error message from time to time and the Toolbar elements icons are gone, as well as the icons when editing text for example.
Strange thing is that I managed to make and save all the changes by "guessing" the icons and clicking (the funtionality seems to be there after all).
Have tried Safari, reseting the browser cash and so on. Also tried FireFox with the same results.
Please check the enclosed screen image.