Speakers thumbnails on homepage disappear

My website initially loads the thumbnail images for speakers on the homepage and then once they cycle through the first rotation, all that is shown is black space.

What can I do to rectify this?

Could you please provide me with a URL to your website and back-end access via PM (click the “Private Message” text underneath my avatar) so that I may analyze it? It is a lot easier for us to diagnose issues when we have a live site to examine.

It's ok now - in the speakers widget configuration there was a mistake. Animation speed was set to 5000 ms and the interval was also 5000ms. (animation was not visible because last very long and in the same time was rotated to the next). I've changed speed to 500 ms.