I am trying to edit the due date to an assignment which has been assigned to groups. I have done this before with individual assignments, but now I get an error message appears indicating this assignment can not be changed because someone in the group has viewed the assignment. I have seen this issue addressed a couple of times since 2007 - is this

I am on a MAC, OS 10.6.3 and use both Firefox 3.6.3 and Safari 4.0.5. I don't see the "my computer" icon when uploading files: I click on the "Upload Files" in the Build Tab and I see the "Class Files" and My File" etc icons, but not for "My Computer". I can however see the "My Computer" icon