When there are multiple viewers on the same page, changes to Caption preferences require a refresh to go into effect.

Steps to reproduce: create a page with multiple Ableplayer instances. Update the caption style (font size, color, etc.). View the captions.

There are also other issues with multiple viewers on the same page; for example, if you hover over buttons (i.e. play, pause, etc.) on a second viewer, the label will appear on the first viewer instead of the second.

Related tickets are #571 and #86. Resolving #571 doesn't seem to solve the problem, though.