by Janet Rogers.
I have had 2 previous problems with a non-functioning ADD button/non-appearing file picker window, but have been able to correct the issue. This week, it has happened again. Making the changes suggested by others in this thread has not corrected the problem. The only recent change to my computer has been automatic installation of IE9 and Microsoft updates.
If anyone has any additional suggestions, I'd love to hear them. BTW, file picker is not functioning when I use either FireFox or IE9, so the problem, at least my problem, seems to be independent of the browser. So far, I am still able to edit text and open documents already uploaded for my courses.