[Rails] Rails 3.1.1 serious problems with model

I have a model called Well in my app stored in well.rb under app/models.
This has worked fine for quite some time. All of a sudden I noticed
that the whole Well section (model/controller/view) was behaving
strangely. I have tracked it down to the model not being recognized as
an ActiveRecord::Base object. I have reduced the model to its minimum,
here it is:

app/models/well.rb

class Well < ActiveRecord::Base

end

When I load the Rails console and run

Well.superclass

I get "Object" in response. While every other model correctly returns

ActiveRecord::Base type in response to superclass method call, e.g.,
User.superclass

Is there something obvious that I may be missing?

Thanks for your time in advance.

Bharat

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