Loading times (free version)

Since the last update the app sometimes "hangs-up"/crashes. This happens always in the following process: selecting one of my Favoristes -> selecting "Preview/Vorschau" -> pressing "refresh". Then the following happens: sometimes the Advertisement is loaded - sometimes not. The picture of the webcam will not load. When I select an other Favorite the same will happen. I have to shut down Worldscope app with Task Killer to get it work again. Think, it could be a problem with the ad-server??
My Phone: Motorola Defy
Android: 2.1