A copy of ApplicationController has been removed from the module tree but is still active!

Yes, more dependencies.rb fun!

As far as I'm able to ascertain, these errors started appearing after
upgrading from Rails 2.3.1 to 2.3.2 and persist in 2.3.3.

They're highly nonderministic and appear rather sporadically, which
makes it extremely frustrating. Multiple developers on our team have
experienced this problem across varying versions of Ruby/Rails.

They're happening in two of our applications. These applications do
not have any of the same plugins except AuthLogic. We are not using
Rails Engines.

The two apps to share a number of gems which are initially loaded
using my require_all gem (using config.gem in initialize.rb). I'm
thinking this might be a potential source of the problems.

I have read about a number of people encountering this problem, and
the general consensus about a workaround is to set the offending class
as "unloadable". Will setting "unloadable" in ApplicationController
propagate to the other controllers which subclass
ApplicationController?

How do we trace down the actual cause of this problem and fix it?

I've not encountered this particular bug, but I wonder if it could be
related to this from Lighthouse:

https://rails.lighthouseapp.com/projects/8994/tickets/1524

How exactly are you loading the shared gems?

--Matt Jones

I've not encountered this particular bug, but I wonder if it could be
related to this from Lighthouse:

https://rails.lighthouseapp.com/projects/8994/tickets/1524

We're loading our gems using config.gem, so I doubt that's the issue.

How exactly are you loading the shared gems?

They all subclass a base class which implements autoloading using
require_all. This happens once when the Rails app is started, via
config.gem in environment.rb