Seeking to or past the end of the video using the keyboard makes the interface get stuck
If a video ends naturally, you get the 'Start Again' button. At that point, you can click it, or just seek back using the keyboard or mouse, and everything works. However, if you seek 'too far' using the keyboard and go 'beyond' the end of the video, the video freezes on the frame before that happened and the UI is no longer responsive.