It's also corrected something which is a bit bizzarre to me.
Have Google as a tab to open with IE8. For the last few weeks the first line of text on Google UK page, the line that says "web images videos" etc has been both "faint" as if written with an incredibly fine pen and also doesnt appear UNTIL you move the cursor over the page at which point it "fades" in slowly.
From deleting the cookies it's all back as it used to be ! Can't explain that one at all.