It would appear that the advertising panes are being loaded into your address browser rather than onto the displayed page. If you click on the black, downward pointing arrow, next to BACK you will notice one or two addresses for vibrantmedia. If you click on the first PCA address underneath them you will be taken back one page. Bit of a glitch and nothing to worry about - sackcloth and ashes for the HTML editor :-)))))).
I can be quite dumb when it comes to Windows, but I found jazzypop's posting a couple of weeks ago useful (right click on the post and click open in a new window). No need for the back button then. However, I keep forgetting after years of bad practice and am trying to learn this new trick with the use of a cattle prod...(ouch).
I would post JPs link but guess what...can't find it.