Same here, I've done it 4 times now and I don't see anything different either. I'm using a PC and Chrome. I don't think the ad is coming from our site, is there a chance the ad is being placed there by your browser somehow?
I did not see it BUT I can tell you that the site does have ads to cover the costs of running this site. The fact the you can only see it when you are NOT logged in tells me that we are not having to see those additional ads when we are registered members.
Personally I had rather see the ads than have to pay to be a member of this forum. Where else can you have unlimited upload space like we do here? Facebook does and it also has ads, Google does and has ads.
I see it on your posts but it doesn't seem to be a system wide event since others cannot see it. I think we need to call in John.