I’ve had problems on websites when I display Google Adsense ads. The problem is a yellow background! Before they show activation and they show up, they will end up with a background. It’s usually yellow if you’re using WordPress. However I’m using their largest ads available on a site but it seems they are filling the gaps right now with smaller images leaving strange yellow backgrounds. Anyway – I found the solution! It’s in your Stylesheet that has a predefined “ins” code.