[SOLVED] atahualpa theme doesn't let open anything apart from the start screen

I've recently created a wordpress site and chose atahualpa as it seemed to be ideal for my needs. I've adjusted some colors, loaded a logo, and basically that's everything I had time to change. In a few days when I wanted to browse the theme options - it turned out that it doesn't open any settings page, only the start screen. I can't do anything. It just wouldn't load. What can be the problem and is it possible to resolve this issue? It's going on for about a week, so I've been patient I think.
I hope the problem is clear, English is not my mother tongue.
Thank you in advance.