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The plot thickens. If I use Internet Explorer as my browser - no problems. My default browser is Mozilla Firefox. Is this where the problem exists? As the present Mrs Flonker would say " I think we should get a man in dear"
I think it is because there is a post on that thread which has got a huge long link URL in it. Some browsers treat this as one word and do not wrap it onto the next line. In order to accommodate it, the page has to be made wider. This is why you have to scroll it. Different web browsers treat the same HTML code in different ways.