Trouble updating a Squeak4.2-10160-alpha image

> I seem to no longer be able to trivially catch up to the latest trunk
> images from a Squeak4.2-10160-alpha image.  Maybe its just a
> load-order problem, I'm not sure..
>
> First, there I encounter an issue with "Please check the size of the
> special objects array."  So, I exited (without saving), restarted,
> Squeak4.2-10160-alpha image, and updated the "System" package, which
> rebuilds that Array to the new size of 56.
>
> However, an attempt to then update at that point results in a "Method
> is already compact" type of error..
>
>