In both cases we got:
couldn’t find file ‘jquery-ui
When trying to access the ActiveScaffold or ActiveAdmin pages.
Turns out the later versions of JQuery remove some things which are still required in Rails 3.2. So locking the version in the Gemfile does the trick e.g. change the gem line to be
gem 'jquery-rails', '2.1.4'
I’m sure this will get addressed in time… but at the time of writing, that line (followed by “bundle”) allows Rails 3.2 to work with ActiveScaffold and ActiveAdmin.