I try to figure out what the problem is. It happends on 2 websites, where on the frontpage only PSAs get displayed. On subpages of these websites, adsense works normal and displays regular ads. Its weird because only certain pages behave this way. Loading the frontpage like www.xyz.com brings up PSA on the ads. Loading the same page like www.xyz.com/index1.html brings the very same page with all ads appearing. On the contrary loading www.xyz.com/index.htm or www.xyz.com/index.html brings up the page with PSAs again. If I add a new page to the site load it like www.xyz.com/newpage.html the page displays fine and loads all ads. I noticed this after I have tested some new META keywords for the sites. However these are the same for all subpages, so it is not really an explanation why Adsense is showing on some pages and not on other. Any ideas what could be the reason? And yes of course robots.txt does allow the Adsensebot to crawl anything he likes. What else can I do/try?
i was suffer with the same problem, when my any page which was 1 deep link, when i rename it with index page, my ads replace with PSAs and i tried several time, i tried to add some more extra niche, also change keywords, but all in vain, my this problem was resolve after 1 or 2 days, so dont worry, it will ok after few days,
this could be due to adsense bot not crawling your certain pages. this is common for new sites. also, make sure you have enough content on those pages so that google can display related ads. if it doesn't get taken care of within few days, inplement section targetting which wil solve the issue for sure. link building will help as well which will get your site crawled on a more frequent basis
Thanks for your replies so far. I should add that the site is PR3 and over a year old. However there was a template and server change but this led to Adsense income skyrocketing so there was nothing wrong with that. If too few content is the problem I wonder why the same index pages gets displayed with ads when I load it as www1.xyz.com and but there is only PSAs when I load it as www.xyz.com. Yes and I should add that the problem exists for 2-3 weeks already. This is so weird.
I have added now extensive additional keyword rich content on that page. So lets see if that brings any changes within the next 24-48 hours.
No changes yet. As said before all other combinations are working. I am tempted to temporarily redirect everything to www1.xyz.com for a couple of weeks and then put it back to normal. What would be the pros and cons if I do this via .htaccess in terms of Adsense, PR and SERP?