Hi, I'm getting a problem on two forums whereby the back button doesn't work. IE7 and XP BTW. When I click on the caret to the right of the back button I can see a list of ad serving URL's such as adrevolver.com, emediate.eu, doubleclick.net in the list beween the current and last pages. I've added these to the restricted sites zone and I'm using spywareblaster. However, they keep coming back. They don't appear on all pages of the two forums - about 50% of the time I can navigate properly. I've contacted both of the forums on this, and they state that they aren't serving the ads in this manner, and that they don't use some of the ad servers in any case. I have started a thread, and other users with the same browser/OS combo aren't having the same problem. I have also seen the problem on my laptop. Any ideas please?