'#' sign at the end of my address bar is causing problems

Hi,


Recently I've noticed this # sign at the end of my address bar when a web page doesn't respond properly.

For example: When I go to a website I frequently use, the address bar looks normal to begin with, then when I click 'log in', instead of letting me put in my details, nothing changes apart from this # sign that gets included onto the end of the address bar, and then the page is basically unresponsive until I refresh the page (sometimes 2 or 3 times before I can put my log in details).

This happens occasionally on a number of websites too, which hasn't bothered me much up until now, because I'm starting to think this may be some sort of virus.

Can someone please tell me what this is and how I can get rid of it?


Any help would be greatly appreciated, thanx in advance.