If I activate Pro Sites all my MU blogs have the 'please pay the bill mofo' error.
I then had to activate and then manually extend every blog from the network admin 'sites' page.
Is it possible to create an option to tick all the sites I want to extend, then hit the drop down to extend.
That list of site ids is then passed to the next page where I select level and date/permanent.
This also minimises the down time of the mu blogs.