Hello All
Thank you again for your help. I have to say that I am not that confident to change settings on my computer.
I have not had this problem for some days, and wonder if as cavuman1 described so well, one of those pages that flashes by gives the choice about cookies. With such a quick flash there is let alone no time to read what the page says or make a choice. Could this thought be possible?
Once I come across a page causing a problem, I shall make a note and post here.
Thanks for all your input.