Thanks Mark. I'm now beginning to think that the cast is only affecting the frames/toolbars in windows. The actual photos look Ok ( I think!!). The 'quick reply' box that I'm typing in now is even surrounded by a light blue frame ! Is that normal??? Maybe this is what it should look like

Maybe I"m going mad
Here is a photo of a white flower (I dont know if this is the best example to use). But I would appreciate if anyone does see a blue cast. Thanks.