I am currently part of a survey exchange group for university students the aim of which is to help people get many responses so to inform their dissertations. When I try to fill out online surveys it says 'Sorry, an unexpected error occured' but these used to work in Firefox and still work in other browsers. It doesn't just happen with surveys powered by one particular website but all of them. Why is this? Can this be caused by a virus by any chance? I haven't changed any settings. Thanks