Anders,
This was actually a server side fix that we made late last week, so no updates would be required on your side. What you do need to do is request a rebuild of your application and our build server will now create an app that can be uploaded.
Did you re-request the build or are you using the same app that was generated last week? If you re-request the build and you still experience the same problem, can you please let us know what the build Id is? It should be noted in the progress view or popup when your app is built.
Also, do let us know whether you are using SR1 or SR2 now. I’ll be adding more details to the forum on this shortly.