Somehow, I seem to have got an annoying malware ad thing which is only affecting a couple of sites in safari. Mainly bbc.co.uk It seems to be in my spare testing account as well so it looks like it's outside my home folder. It is very strange and subtle, it seem to be able to modify safari adblock extension. What it does is it will show an ad when Safari is opened and adblock will not block it even though the adress is in adblock, but if the page is reloaded it then will block it. After a while it appears to disable Adblock. Uninstalling and reinstalling fixed adblock for a short time. There is no problem with Firefox. This is the address of one of the ads on the bbc Code: http://adclick.g.doubleclick.net/aclk%253Fsa%253DL%2526ai%253DBpPreRuFwUor1O8OclQX97IGQDvr1o-oDAAAAEAEgADgAWKrq8Z9yYKWglYCYAYIBF2NhLXB1Yi0yOTE3MjkzODI4NTc4MzAzsgELd3d3LmJiYy5jb226AQlnZnBfaW1hZ2XIAQnaARNodHRwOi8vd3d3LmJiYy5jb20vwAIC4AIA6gIqNDgxNy9iYmNjb20ubGl2ZS5zaXRlLnd3dy9iYmNfaG9tZXBhZ2VfaW50-AKB0h6QA6gKmAPQBagDAdAEkE7gBAGgBh8%2526num%253D0%2526sig%253DAOD64_3bB3QUoTX5PGezmuGzTwgjiQJcUQ%2526client%253Dca-pub-2917293828578303%2526adurl%253Dhttp://ad.au.doubleclick.net/clk%3B276431482%3B103612918%3Bd And this is what the ad looks like. I have cleared out the safari caches directly from the cache folder. I'm at a bit of a loss as to how to track this down. I have run clam xv but nothing showed up. And reset Safari. thanks.