Thank you, but that did not solve the problem. I have been using html/css optimisation for many months with no previous problems.
Here is one page which displays only symbols:
http://msdn.microsoft.com/en-us/library/ms997636.aspx
I think it is something wrong with my isp. Nothing else has changed. I have re-installed FastUN, deleted all new add-ons: no change.
But my isp (I am on dialup) was slowing down a lot over the past week and kicking me off, then suddenly the connection is very fast and FastUN stops working properly. It is most likely to be them, but now I really don't know what to do except stop using FastUN.
Is there anything I can do to find out if my isp is the problem and work around their settings perhaps?