Opera 'back' button is driving me crazy!

[xr7kid]

Whenever I'm done scrolling around a page I hit the back button expecting the previous page, however it just jumps up to where I last scrolled from or will do nothing and then the button blacks out! This is frustrating, and it happened on the official rom update for my Diamond too! Why is my copy of Opera retarded and how can I fix it? What version of Opera came with the Diamond shipped rom? I'd like to install that and link it to the Internet tab if possible. Halp!