Helper module not included on subsequent requests form engine gem in development from passenger


I'm working on a Rails 2.3.5 based gem that acts as an "add-on" for an
existing application. It basically pulls in functionality from
another more generic gem and sets up the application to use it.

In its rails/init.rb it adds some helpers to ApplicationHelper.
Here's the init.rb file:

and here is the other gem's lib that is being included:

My issue is that after the initial request to my app on a view that
calls one of those helpers, I get a method not defined error if I'm in
development mode (production works as expected).

I've tried a few different things (unloadable and wrapping method
definitions in unless modules.include? TranslatablesHelpers
conditional), but am not making any headway.