Oh, thanks! I upgraded to 1.2.1 this morning, and voilà! It works!
Martin, Eloy, et al., you guys not only make this system extremely attractive by providing good timely support, but you also make me look good in front of the teachers here. 
Resource types
new "Upload/Select Files" screen fails with Safari
Keskustelu on lukittu, joten et voi enää vastata siihen.