Similar to what Google has been doing with ads in search results, they also now restricted the clickable area in AdSense (the kind of Google ads webmasters can include on their pages). Instead of allowing a click to be triggered in a broad rectangle around the text – which used to include whitespace in that area – you must now click specifically on the underlined title or the colorized URL below the snippet.
There's a big discussion about it here: http://forums.digitalpoint.com/showthread.php?t=559150 . I personally don't like the change. I tried to click an ad that interested me yesterday, and I was clicking in area around the text. My brain didn't tell me to click the title or url, until I remembered this change.
Millionth thread on the situation. It's just going to turn into another " My CTR is down! " " My Revenue is up! " thread.
Do you know how to use the search button? This has already been covered: http://forums.digitalpoint.com/showthread.php?t=559150