Activation fails on iPad running iOS Beta 7 This morning my iPad wanted to activate itself once more and at some point I receive the following message:

We're unable to complete your activation on my iPad
This device is not registered as part of the iPhone Developer Program. If you are a member of the Program, please register your device in the http://developer.apple.com/iphone/.

I am member of the developer and I have registered this device. What should I do?
Try updating to the GM. It's the last usable version for the dev's.