Content Slider doesn’t work in the pro version

It appears the ‘content slider’ style has an error, as it just hangs on loading and has a js error expecting a closing “<” which means the slider doesn’t load. Also – when I use an external url for youtube – the image is the youtube thumbnail – which then appears blurry. I have tried using an image uploaded to media library but when it saves, it reverts to the youtube thumb which is much smaller.