My mouse wheel appears to work on any pages where I tried it. Can you give an example of a page where yours does not work? Does it fail consistently on that page? Or does the problem sort of drift around to different pages at different times?
The operation of the mouse is almost entirely controlled in the operating system (Windows, or whatever), so I'm not sure there is anything forum-specific that could cause the problem. But I am in no way an IT guy or a software guru. By the way, what is your OS?
Bill