Same behaviour here. I see <object> tag missing from student interface, just after <a>. Other roles (teacher, admin) have properly formed <object> tag.
A. Saavedra
Lesson
Teacher can see the flv movie, but student cann't
Гэтае абмеркаваньне было заблакавана, таму вы болей ня можаце адказваць на яго.