I am a huge fan of Google Ad Manager, the hosted ad serving solution from Google. The only issue is that those who heavily use AdSense run into issues when they wanted to test out using Ad Manager with AdSense. What is the issue?

Google does not communicate clearly that after an AdSense channel has been imported to Ad Manager to become a placement, this change is permanent, and you will no longer be able to use that channel in your AdSense account.

There have been complaints about this in the Google Ad Manager Help forum since earlier this year.

Steve, from the Google Ad Manager team, explained that this is the case due to technical reasons. He said there is an alternative:

The main issue is still an issue. Why is there no warning of this before allowing AdSense publishers to make the transition to Google Ad Manager? Many AdSense publishers do not need the features of Ad Manager, and they learn this quick. But once they switch, those channels are locked forever and they can’t go back.

Forum discussion at Google Ad Manager Help.

This story was pre-written and scheduled to go live on May 29th.