Hi Mary
i am having a "similar" problem on a brand new 2.6.2+
I made a "screenshot video" uploaded it to Youtube (
some students can watch it and for others it stops after 15'
it seems to the same problem In Firefox 28.0 / Chrome and IE
this behaviour is replicated in in the 'embedded' and 'clicking on the link' version
cheers
v
ps
if you have time to watch/listen to the video can you pick up on the (english) accent ?