I have a 300x600 adsense unit in my sidebar set to image/text and it's creating a lot of white space. What's happening is Google is occasionally showing just a single ad in the unit which sits at the top of the unit but leaves three quarters of the unit blank which looks funny since it keeps the content below it pushed all the way down.
Is there a way to stop adsense from showing just one ad in this tall unit? It's ugly and annoying with all the white space.
For now I've stuck the unit at the bottom to minimize the broken look it creates but ideally I could stop the behavior entirely and move the unit back up the page.
Thanks for any tips on this.