DanG wrote:actually, it only ever happens on IE
i've never once seen it when using another browser
Likewise. It was driving me nuts on IE, but I've swapped over to Firefox (due to general security hole issues with MS) and not once had anything remotely like it. Of course that may only mean that it's better at dealling with / ignoring whatever causes the problem than IE is.
(and since many of the O/S browsers share the same underlying engine, many of them may have this "immunity").