I go to http://testengage.usask.ca:8080/engage/ui/watch.html?id=e3bd1149-014b-44da-8370-79463e34f453 and opened up the comments tab. Then I click on the little + in a bubble by the scrubber (using ff 18.0). Numerous issues, first, the "Type Your Comment Here" is confusing because I can't see the outlines of any of the text areas. Second, I have no idea what to do when I am done - hit enter? hit the plus button? The x? Just click off the bubble? What saves my comment.
Finally, there is a string that says "undefined" at the time stamp. Note that I haven't started the video yet, so where will this comment go? I think the colour scheme for this component could use some more eyes, it looks off to me.