I can see the ads on mobile but not desktop. Others can see the ads because I can see views and clicks recorded in my Adsense reporting. However, it can be very frustrating to not know how the ads look on the laptop (white background appears whee the ad would be). It's been like this for about 6 months. I can't figure why? Even after I replace the ad code with a new ad code, the problem won't go away.

Regarding a different matter, what matched for content size do you use? I am trying the responsive but the problem is that on mobile (can't check laptop because of problem described above) it often misses a key word from the page title, because of lack of space, which can reduce clickthrough, so should I go with 300px width and around 400px height as this should be fine to dsiplay on the mobile. Also are you guys choosing the content only or the content and ad option? I figure, since you want to increase page views it may be better to go with content only, and maybe the user will click on ad on the next page.