Hex Editing This post should help you, its a little difficult for most, but still possible and if you get stuck with the editing, we will be glad to help.
Its not a bug, the battlefields get randomly generated when you first enter them in each act. Its entirely possible that something blocks your path <img src="/ubbthreads/images/graemlins/disagree.gif" alt="" /> and not unheard of either <img src="/ubbthreads/images/graemlins/disagree.gif" alt="" />
