Normally after I have looked at a thread, I'll use the back button to go back to the main forum page.
Today I used the back button and nothing happened. Thinking once again the site was playing up, I waited.
After a short period I thought I should investigate. On looking the history (See image) there are two lots of them ad thingies. This is very iratating, and generally if a site have this method, I never go back to it.
Is this going to be the norm from now on. Or is it something that has just occured.