CC noticed that in a full transcript, if there is a link (<a href="#" class="tooltip">) on the bottom line of text that causes a popup tooltip thingee to appear below the text, that div appears outside the viewport on the page. The page generates a scrollbar to (in principle) allow the user to scroll down to see the gloss, but if the user moves the mouse off the link, then the gloss window disappears.

I added some padding to the bottom of the detailpanel div (which contains the full transcript) - enough to accommodate a three or possibly four line gloss. The popup handling in the individual subtitles positions itself properly, so is not an issue.