When watching a video in sentence view, I have trouble clicking the button to move to the next sentence because it’s largely overlapped by the video. This has been happening for the past few weeks, but there was a time where it didn’t happen.
Strange, we will look into it. Thanks for reporting!
I just discovered that this and similar issues with video covering vitally important things (in my case, the actual text of the lesson) can be resolved in Firefox by using the browser’s “zoom” option (found via the three-bar application menu at top right of screen) to reduce the size of the video and everything else on the page until there is no more overlapping. 