I too experienced this issue when running a university-based workshop. Afterwards I was told there was an Internet Explorer Explorer(IE) issue that it was likely to be. I will try and update this answer with more information be. The lack of support for IE is briefly mentioned on the [iD page][1] of the OpenStreetMap wiki. As Firefox also has limited support, it seems the best suggestion would be for the user to install the [Chrome web browser][2] if I can find any.they want to use the iD Editor (and thus follow the same instructions from you) rather than other editors. [1]: http://wiki.openstreetmap.org/wiki/ID#Use_it [2]: http://www.google.com/chrome/

I too experienced this issue when running a university-based workshop. Afterwards I was told there was an Internet Explorer issue that it was likely to be. I will try and update this answer with more information if I can find any.