Page edits reverting back to default

I am using the adventurous theme and when I attempt to edit the following fields in 'page edit' (sidebar layout, header featured image options, content featured image options) as soon as I click 'update', the changes will not be remembered and when I go back to those areas, they've reverted back to the default choices. I was brought to this issue by my attempt to properly install a 'featured image' on my page, which has shown up like this openroadtravelperu.com/our-tours and not in the actual header of the page like this http://catchthemes.com/demo/adventurous/about/ (the Buddha photo) I've searched all the wordpress forums and am about driven to tears by frustration right now. I'm not sure if this is a theme issue or a wordpress issue. Please help :( Thank you