For now could you turn the thumbnails back on, but if you want to turn them off you can just use the css below to get rid of the scrollbar too
Please drop that in Quick CSS in backend
How exactly are your portfolio pages made?
Because there is a way to show a completely different image and description for the Feature homepage slider than the slider on the page where it points to. Take a look here https://docs.google.com/file/d/0B8hqGBMSfHtKLVZqYWtQYVc5Mkk/edit I made a video a couple of days ago explaining to someone else how to go about doing this. Because if you do something similar to this video but added yet another template it may be possible for ID numbers to get mixed up somewhere along the way (theoretically i guess).
I wouldn't bother trying to unwind this, instead setup dev.your-domain.com put everything back onto it, one piece at a time, an then just switch virtual host directories. This way it will be seamless. Meanwhile I will try to replicate this myself as wel.
Edit: What is that business directory plugin and the rating plugin? Its putting in a ton of jQuery after the framework. Could you disable them and see the results. Because it looks like something is rewriting everything, and that sounds like renegade jQuery.
By the way, you also have 2 identical Analytics blocks, and the third Analytics block writes your ID at the bottom left of the page.