What's a "back button"? Is this feature within your respective browsers?
If it is, I rarely use it because I opt for the easier to use keyboard shortcuts of 'alt + left arrow', or just 'z' when not in a text box. (pressing 'z' is Opera-specific only, I think). Also, the backspace button should work as well, but I don't think I've pressed it more than ten times total in the three years I've had this CP.
---------- Post added at 12:28 AM ---------- Previous post was at 12:26 AM ----------
EDIT:
after the quickest google search ever (Opera's g + back button) I found an intriguing article that may be your answer (specific problem).
Back button in Internet Explorer becomes unavailable
---------- Post added at 12:30 AM ---------- Previous post was at 12:28 AM ----------
nvrmnd, the article is from five years ago