[Rails] "class Date needs to have method `_load'" in Rails 3.1.3 and Ruby 1.9.3-p0

Hi folks,

I've got a Rails 3.0.10 app in production that I spent significant time
upgrading to 3.1.3. It's all running in development without any issues,
but when I deploy to production and access any page I get the error
"class Date needs to have method `_load'" with no associated page or
line number.

I'm running Ruby 1.9.3-p0 in both environments.

Development is running on OSX, while production is running the most
recent version of passenger(apache) on Ubuntu.

Any thoughts?

Thanks,

Jason

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