Since upgrading to Ruby 1.9.2 (Rails 3.0.3), our RSpce (2.7.0) tests using
FactoryGirl (2.3.2) fail due to BCrypt::Errors::InvalidSalt upon creating
of user fixture. Here is what we use for creating fixtures:

Factory.define :user, :class => User do |u|
  u.email '...@other.com'
  u.api_key '123456'
  u.password 'password'
end

It used to work fine, but now tests that have the line user =
Factory.create(:user) fail randomly with different tests failing in each
run.

Any ideas?

This was only happening on my Mac box, not the Linux production servers. It
seems to be fixed by uninstalling bcrypt-ruby gem (it was 3.0.1) and
installing it again (same version). I am still not sure why but the issue
is fixed.