I18n and Rails 2.3.5

Has anybody faced any problem to use i18n on Rails 2.3.5? Sometimes when I call the t function, it works fine, but for some keys, it does not work and I have no clue why it is going on.
I do have a .yml with correct keys and values. For example, in this (http://dev.promine.com.br/promine) page, i18n is working properly, but in this (http://dev.promine.com.br/servicos) one, it isn’t? Any suggestion about what is happening? Thanks in advance.
Rodrigo Felix

Does anybody know if the word “services” can be a key into a i18n file? If I use “service” I can get the value, but when I use “services” a translation_mission error is showed. Really weird.

I figured out what was going on. I had defined a routes.yml to translate the routes and into this file I had a key “services: Services”. So, it was overwriting the value of a services key (with children keys) that I had defined into another file. Thanks.