I have a template that shows 3 Adlink units on each page.
On pages that have a large amount of content, I'm experimenting with adding one of the new responsive adlinks in the page content, for a total of 4 Adlinks on the page.
Here's what I've done:
1) I've gone to an existing page on my site and viewed its three adlinks.
2) I've then added the 4th adlink.
3) When I then save the page and view it, I notice that the lowest adlink on the page (one of the adlinks that less than a minute before I've visualized) now no longer shows.
There is no question that this occurs in every instance.
I started testing several pages yesterday (placed a 4th adlink on them, I didn't notice the problem then). Now 24 hours later the bottom adlink still doesn't show (so it doesn't seem to be that the Adsense serving system has some sort of trial period where it adjusts to the 4th adlink and then starts showing all of them.)
Interestingly enough, I've just added a 4th adlink unit to some pages and right now the new adlink shows as a blank because it is new and not yet active in the Adsense system. But just the fact that this 4th adlink unit's code is on the page keeps the bottom adlink from showing (so there are two blank adlinks out of the 4 right now).
I contacted Adsense chat support.
That person said 4 adlinks is permissible.
She also stated that Adsense does not interupt the display of ads at their end (as in if a 4th unit was not allowed they would not keep it from showing).
Has anyone had this same experienced?
Is anyone successfully showing 4 adlink units on a single page?
This isn't a giant issue for me since the adlink unit that doesn't show has such a low eCPM. But I'd like to understand what the problem is before making template changes to circumvent it.