I had th same problem look like user jacoba55. First I bought Sponsor Door and it didn't run. So the Team from Pulse Extension asked me for using Sponsor Wall for free. Sponsor Wall was up and running. Few days later I tested Sponsor Wall again and it didn't run again. The reason was, few days ago I have been installed the paket "gcalendar" and after uninstalling Sponsor Wall is up and running. Sponsor Wall is a pretty fine extension and the support from Pulse Extension is very good.