merb 0.4.0 session issue

[frazer horn]

Not sure if anyone else has had this problem.

I was running on merb edge fine a few days ago.  Last night I went to
merb 0.4.0 via gem install and now any call to session[:foo] causes an
error >> undefined method '[]' for nil:NilClass

I have uninstalled and reinstalled merb with no luck.

dependencies.rb
use_orm :activerecord

merb.yml
:session_store: active_record

Gems
merb 0.4.0
merb_activerecord 0.4.2

Mac OSX

Any help appreciated.