Just updated to iOS 5.3 beta and the icons all needed to refresh, which is fine. They've all filled in on the Login list but the ones showing in the Favourites list are missing still, even though their Login counterparts have downloaded ok.
As I was typing this the app closed itself due to the timeout. Unlocking it with the PIN refreshed them. A minor niggle but something that can probably be fixed easily.
Thanks for letting us know! I'm glad that they all downloaded eventually. We'll keep an eye on this.